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Old 02-26-2014, 01:51 PM   #1
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SLP Loudmouth really THAT loud?

I want/need to get a new exhaust set up for my 01, and had my heart set on O/R xpipes and the Loudmouth 1 catback because go big or go home right? Heard from a mechanic friend that I should just stay away from SLP because they're too loud. He said that you can't hear yourself think even inside the car, as in pointless to listen to music and driving for more than 20 minutes will give you a headache.

Are they really that bad?
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Old 02-26-2014, 02:01 PM   #2
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They're basically just resonators so yeah, they can be loud as hell. Some ppl think they aren't so bad, me personally I think that the overly loud exhausts are toolish and obnoxious. There are plenty of great sounding exhausts that are mild but still noticable at idle/off idle but will scream when you punch it. Magnaflows and Dynomax Ultras are a great example of this. I'd stay away from the Dronemasters too.
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Old 02-26-2014, 02:08 PM   #3
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I don't know why a lot of people rag on flowmasters. Flowmaster 10 series mufflers have great sound. I experience almost no drone, maybe I have a higher tolerance for drone or something I don't know. The choices Scotty mentioned above are great choices as well, just wanted to throw in flowmaster 10 series. To each their own I guess. Everyone has an opinion on exhaust and in the end it's your car do what you like.
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Old 02-26-2014, 02:11 PM   #4
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Everybody on here seems to love their SLPs, maybe because they haven't heard a good sounding catback yet, but I personally hate them. +1 to what Scotty said I love my Magnaflows
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Old 02-26-2014, 02:15 PM   #5
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Yeah I don't get the flowmaster hate either. It's not like they are the only mufflers with drone??

Plus.. An H pipe + flows = secks!!


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Old 02-26-2014, 02:17 PM   #6
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I bought my car with stock hpipes and it has some unknown variety of flowmasters. It sounds good, don't get me wrong, but I still want to go louder. I guess I'll go a different route than the SLPs. But I still plan on sticking with the o/r xpipes. I'll have to browse around youtube and try to find something new I like.
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Old 02-26-2014, 02:48 PM   #7
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Yeah I don't get the flowmaster hate either. It's not like they are the only mufflers with drone??

Plus.. An H pipe + flows = secks!!


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No they are not, most chambered mufflers have a way worse drone than a striaght through but I can tell you from experience on my own cars and driving other ppl's cars... flowmasters drone like crazy in comparison. I also think they get way too raspy and tinny sounding up top with the trade off that they do (I admit) have one of the best sounding idle and off idle tones there is.

I dunno, my Ultras were deep and throaty at idle but not overly loud. Same at off idle but when you stomped on it they would REALLY scream, like a totally different muffler and ppl always asked me wtf I had. I think I was the only person with a stang in Dover that had them. 90% of ppl had flows, a few ppl like my roomate had the good sense to take advantage of a $400 installed Magnaflow catback price (these were 2004 prices) that a local exhaust shop was doing and then there were a few snowflakes like me with other brands.
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Old 02-26-2014, 05:02 PM   #8
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Magnapacks!

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Old 02-26-2014, 06:38 PM   #9
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I just installed them and yes they LOUD only when you punch it above like 3000 rpm. But just like daily driving I shift like a normal car and just has a humming noise which is cool when your driving next to cops. They don't even notice
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Old 02-26-2014, 06:43 PM   #10
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SLP Loudmouth really THAT loud?

Well I have heard many exhausts and I beleive a lot of the choosing process is personal preference, everyone has their own opinions about other exhaust. I personally had flow masters on my car when I bought it and absolutely hated them. I currently have longtubes, O/R X pipe and slp loudmouth 1s. I like it and they scream at WOT. Not everyone likes them but I get nothing but compliments with them. Everyone will throw their own opinions about mufflers and other exhaust choices and tell you that THIS is what you need but in the end it's your car and your decision. Best advice is to listen to different ones (preferably in person) and make your decision then.
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Old 02-26-2014, 06:48 PM   #11
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Yup what he said^ and go on you tube there's a ton a videos
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Old 02-26-2014, 07:16 PM   #12
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I personally like the SLP's. They're loud, poppy, crackly, and just overall obnoxious. But they sound pretty good. I have a video taken from inside my car with Offroad X and bassani catback, driving around with a mustang with offroad X pipe and SLP LM 1's. Now, my car is loud. You can hear it from several blocks away while normal cruising. His car, completely drown out my exhaust. That'd how loud it is. It's a very aggressive set of pipes and not for the faint of heart.
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Old 02-26-2014, 07:26 PM   #13
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I test drove a 2003 Mach 1 with the slps and offroad x. It was an automatic and I couldnt even talk to the salesman going down the road. Don't get me wrong, it had an awesome sound. I personally like the Borla stingers on the 2v cars 99-04.
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Old 02-26-2014, 11:33 PM   #14
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Mines is not crazy loud and I have headers idk if you guys slamming on the car the whole time..my car is a daily and it's not stupid loud unless I punch it hard but nope not crazy loud for daily driving. No compliants here
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Old 02-27-2014, 12:32 AM   #15
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Depending on what state you live in, getting an o/r mid pipe can be a problem with inspection/emissions. I'd at least recommend having hi-flow cats in your mid pipe. That'll give you desired noise without all the raspy sound.
As for exhaust choices… theres hundreds of combinations you can pick, each sounds different. Just have to find what's right for you. Good luck on your search and enjoy it!
Attached is a vid of mine with just the magnapack cat-back (fly-by)
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Old 02-27-2014, 12:35 PM   #16
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Depending on what state you live in, getting an o/r mid pipe can be a problem with inspection/emissions. I'd at least recommend having hi-flow cats in your mid pipe. That'll give you desired noise without all the raspy sound.
As for exhaust choices… theres hundreds of combinations you can pick, each sounds different. Just have to find what's right for you. Good luck on your search and enjoy it!
Attached is a vid of mine with just the magnapack cat-back (fly-by)
Yea no cats won't fly here in PA, but realistically it's not that hard to find someone to slap a sticker on the windshield.
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Old 02-27-2014, 12:42 PM   #17
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Cats don't fly here in NJ either but its all of a half hour to swap pipes from start to finish. Swap the day before going to emissions or the day of and swap back as soon as the pipes are cool enough after you get back.
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Old 02-27-2014, 12:48 PM   #18
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Cats don't fly here in NJ either but its all of a half hour to swap pipes from start to finish. Swap the day before going to emissions or the day of and swap back as soon as the pipes are cool enough after you get back.
Honestly that's what I originally planned on doing. I watched an AmericanMuscle video on how to do it and was pretty surprised at how easy it was. My only problem is getting underneath the car.

It was lowered a bit before I bought it. To the untrained eye one won't notice but the cats on the stock hpipe hang so damn low now that sometimes I cant avoid scraping. There's even a hole in my one cat now from it (partially why I need a new set up). I could barely even jack the damn thing up to change the oil, it took some force to get the jack where it needed to be just to get under the car.

I just don't have the availablity to do it myself or else I would. :/
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Old 02-27-2014, 12:56 PM   #19
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Buy ramps from autozone, go buy a 8' long 2x8 from home depot, have it cut in half to two 4' long pieces while you are there for free. Place ramps, place boards halfway down ramps, you can now drive a lowered car onto the ramps. This is how I do the oil on my 98 when I don't feel like patronizing the worst on base auto/hobby shop in existence.
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Old 02-27-2014, 12:58 PM   #20
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+1 scottydsntknow,

TOO Loud = Tool/obnoxious
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Old 02-27-2014, 01:01 PM   #21
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Iv got longtubes and prochamber and I just dumped my exaust right after my prochamber and I LOVE it. I ha slps before and I loved them 2. But honestly if your ganan buy some slps just save yourself some money and dump your exaust
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Old 02-27-2014, 01:02 PM   #22
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Buy ramps from autozone, go buy a 8' long 2x8 from home depot, have it cut in half to two 4' long pieces while you are there for free. Place ramps, place boards halfway down ramps, you can now drive a lowered car onto the ramps. This is how I do the oil on my 98 when I don't feel like patronizing the worst on base auto/hobby shop in existence.
For oil I'm gonna have to do that, but I can't imagine that would be enough room to work with to replace the exhaust. I think my one buddy has ramps and he actually works at home depot lol. I'll have to try sometime and see what kind of room that gives me.
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Old 02-27-2014, 01:03 PM   #23
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Iv got longtubes and prochamber and I just dumped my exaust right after my prochamber and I LOVE it. I ha slps before and I loved them 2. But honestly if your ganan buy some slps just save yourself some money and dump your exaust
I wanted to kill myself every time I had a 20+ minute drive in a setup like that in my 91. When I got out one day after a 2 hour drive home and my ears were ringing that was the day I decided to put tailpipes on. A few months later someone hit that 91 in a parking lot and I drove a beater for a year until I got my 95 Cobra. THAT car had tails and straight through mufflers.
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Old 02-27-2014, 01:25 PM   #24
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I have really bad hearing so honestly it doesn't bother me at all in my 05 gt. Everyone tells me it really loud but honestly I don't fell like it is. I'll drive around with my speakers up almost all the way and with my exhaust and my ears don't hurt at all
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Old 02-27-2014, 01:30 PM   #25
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It's not that bad I have slp with x pipe and its loud when in wot but regular driving its very tamed . It's not ear piercing loud in the cab . Not even close . I enjoy mine very much and wouldn't get another exhaust . I simply love my slp .
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Old 02-27-2014, 02:03 PM   #26
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SLP Loudmouth really THAT loud?

Running O/R UPR X pipe with super 44s. Loud when you step on it but cruising at 75 mph is quiet. No drone. Can talk, listen to music etc.

Edited: Stock gearing as well though. Stays below 2K rpm
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Old 02-27-2014, 02:16 PM   #27
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Running O/R UPR X pipe with super 44s. Loud when you step on it but cruising at 75 mph is quiet. No drone. Can talk, listen to music etc.

Edited: Stock gearing as well though. Stays below 2K rpm

That's why you don't have drone. Take it up to 2200-2400 RPM and that's how loud most ppl with the flows have it at your normal cruising speeds in OD.
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Old 02-27-2014, 02:37 PM   #28
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Anyone have magnapacks? They seem to sound pretty badass with the o/r xpipes. Whats the quality like on them? I really hate going off youtube alone lol.
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Old 02-27-2014, 02:48 PM   #29
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Remember, exhaust sounds a lot quieter in the car than outside of the car. My exhaust is ok loud inside the car and sounds deep all the time to me. But when I finally had my dad drive around the block for me to hear it outside it sounded a lot louder and more aggressive.
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Old 02-27-2014, 04:10 PM   #30
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Anyone have magnapacks? They seem to sound pretty badass with the o/r xpipes. Whats the quality like on them? I really hate going off youtube alone lol.
I've got magnapacks now with LT headers and catted x pipe. They sound amazing IMO and was the only exhaust I found with such a deep tone with headers and x-pipe. Magnaflow has very high quality products. The only problem I had with them were the rear hangers weren't the best at staying in place
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Old 02-27-2014, 06:04 PM   #31
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That's why you don't have drone. Take it up to 2200-2400 RPM and that's how loud most ppl with the flows have it at your normal cruising speeds in OD.



Exactly, lol.
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Old 02-27-2014, 07:53 PM   #32
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I've got magnapacks now with LT headers and catted x pipe. They sound amazing IMO and was the only exhaust I found with such a deep tone with headers and x-pipe. Magnaflow has very high quality products. The only problem I had with them were the rear hangers weren't the best at staying in place
I'm leaning towards that now actually. Minus the headers. Unfortunately my printing press in my basement broke so headers are gonna have to wait awhile cause those are gonna cost my left nut.
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Old 02-27-2014, 08:34 PM   #33
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Actually, I just looked into it again. I definitely thought headers were A LOT more. Still gonna wait on those though. Midpipes and catback are my first priority right now.
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Old 02-27-2014, 08:55 PM   #34
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Actually, I just looked into it again. I definitely thought headers were A LOT more. Still gonna wait on those though. Midpipes and catback are my first priority right now.

Start with headers first then trust me

---------- Post added at 07:55 PM ---------- Previous post was at 07:55 PM ----------

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Actually, I just looked into it again. I definitely thought headers were A LOT more. Still gonna wait on those though. Midpipes and catback are my first priority right now.

I wish I would started with headers and went back
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Old 02-27-2014, 09:55 PM   #35
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I have magnapacks and an o/r x pipe. I love it sounds really good. Videos don't do it justice at all. I have had slp 1s, hated them, flowmasters , they were OK, dynomax also OK. Magnaflow mufflers are very good quality stainless steel.

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