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Old 06-27-2013, 03:33 AM   #1
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Exhaust Talk

So I work with a guy who used to work at a exhaust dyno.
He pointed out to me that running no cats and loudmouths is actually hurting me.
Saying no back pressure , which is pretty much true because its pretty much straight through.

Does anyone recommend any mufflers? Besides flow master? He told me to check out dyno max 5 series..
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Old 06-27-2013, 04:49 AM   #2
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I'm a fan of magnaflow personally. But I was under the impression if you have a tuner for your exhaust you'd be okay.
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Old 06-27-2013, 05:38 AM   #3
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Hmmm. Looks like you're working with a perpetuator of the no backpressure myth . I guess the key word was "used" to work at an exhaust dyno shop. I sure as hell wouldn't listen to anything he has to say regarding exhaust. Let me get this straight. We're all supposed to be freeing up our exhaust right up to this certain magic point where there is just enough backpressure to make our engines run at peak performance? Bull****. Period. Backpressure has nothing to do with the way that your engines perform. NOTHING. Other than give it less power, of course. That is what tuning is for. Here's my recommendation for your exhaust. If you like the way it sounds, keep it the way that it is and get your car tuned with that exhaust. And for you guys who are going to want to comment in favor of backpressure, I'm going to refer you to one of Cliffyk's recent posts where he was kind enough to post one of the most clear and concise articles on this subject that I have ever read. Search for it. It will enlighten you...
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Old 06-27-2013, 05:46 AM   #4
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Hmmm. Looks like you're working with a perpetuator of the no backpressure myth . I guess the key word was "used" to work at an exhaust dyno shop. I sure as hell wouldn't listen to anything he has to say regarding exhaust. Let me get this straight. We're all supposed to be freeing up our exhaust right up to this certain magic point where there is just enough backpressure to make our engines run at peak performance? Bull****. Period. Backpressure has nothing to do with the way that your engines perform. NOTHING. Other than give it less power, of course. That is what tuning is for. Here's my recommendation for your exhaust. If you like the way it sounds, keep it the way that it is and get your car tuned with that exhaust. And for you guys who are going to want to comment in favor of backpressure, I'm going to refer you to one of Cliffyk's recent posts where he was kind enough to post one of the most clear and concise articles on this subject that I have ever read. Search for it. It will enlighten you...
Well he stopped doing it because there wasn't enough money in it.. He made custom x pipes and h pipes , piping for alot of drag cars, road racing-cars, etc. He is around 45-50 and very smart, he went to school for it and all. I believe what he says, he isn't the kind of bull****ter..

Well not saying that your wrong but just because you like the way your car sounds doesn't mean your getting the top performance out of it.. Correct me if I'm wrong but having a loud car doesn't always mean you have a fast car. Idk ,

---------- Post added at 05:46 AM ---------- Previous post was at 05:43 AM ----------

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Originally Posted by straybullitt View Post
Hmmm. Looks like you're working with a perpetuator of the no backpressure myth . I guess the key word was "used" to work at an exhaust dyno shop. I sure as hell wouldn't listen to anything he has to say regarding exhaust. Let me get this straight. We're all supposed to be freeing up our exhaust right up to this certain magic point where there is just enough backpressure to make our engines run at peak performance? Bull****. Period. Backpressure has nothing to do with the way that your engines perform. NOTHING. Other than give it less power, of course. That is what tuning is for. Here's my recommendation for your exhaust. If you like the way it sounds, keep it the way that it is and get your car tuned with that exhaust. And for you guys who are going to want to comment in favor of backpressure, I'm going to refer you to one of Cliffyk's recent posts where he was kind enough to post one of the most clear and concise articles on this subject that I have ever read. Search for it. It will enlighten you...
I think back pressure has alot to do with performance and deals with the HP/TQ curve , ..

You can't just run open headers or cut outs and expect the same peak power as someone running 2.5" Pipes.. Think about it. It's all different and affects your power band, idk anyone else?
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Old 06-27-2013, 05:51 AM   #5
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My exhaust is bone stock. Your buddy is wrong Slow. Plain and simple. Ive said it on here before, and I'm sure I'll have to say it again: If backpressure was necessary for maximum performance top fuel dragsters would have mufflers on top of the Zoomies.
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Old 06-27-2013, 06:08 AM   #6
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My exhaust is bone stock. Your buddy is wrong Slow. Plain and simple. Ive said it on here before, and I'm sure I'll have to say it again: If backpressure was necessary for maximum performance top fuel dragsters would have mufflers on top of the Zoomies.
Well what about the power band? I'm sure having cut outs vs a cat back have major differences.

I'm just trying to get the best from my exhaust.
Don't have long tubes yet just have a off road X and loudmouths..
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Old 06-27-2013, 06:30 AM   #7
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Yes. The exhaust can be tuned. It has more to do with flow than backpressure. But you tune an engine for whatever backpressure that there is. If there is none, thats what you tune for. I don't recommend everyone going out and getting straight pipes. The car is going to sound like crap. Get the exhaust that sounds best to you. But the comment about your car making more power through the cats is just completely false. That guy should know better...
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Old 06-27-2013, 06:40 AM   #8
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A combustion engine doesn't need any back pressure at all to run at peak performance. Different flowing exhaust will change your power curve and that's all. My car made 255 with flows and a two catted midpipe and then I went off road with slp and it made 268. It's all in the tune. Most of your back pressure is also made from the collectors off the manifold or headers. All the exhaust gases going into one will cause there to be some
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Old 06-27-2013, 10:55 AM   #9
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With no back pressure you may lose a few ft lbs of torque that's all but you gain it all back and then some up top it basically just pushes your power band up to higher rpm range
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Old 06-27-2013, 11:00 AM   #10
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With no back pressure you may lose a few ft lbs of torque that's all but you gain it all back and then some up top it basically just pushes your power band up to higher rpm range
+1 the debate over backpressure is that people say the engine needs it. It doesn't. It just shifts your power band and with a mostly stock car designed to run low to mid rpms people get the feeling that they lost power and therefore say you need backpressure. It's like when you swap cams it changes the power band. You don't lose power it just shifts the power band to higher rpms so below a certain rpm you won't notice but at about 3000rpm and up you'll feel it. Almost the same kinda issue. Idk if that helps you understand it or not but I tried lol
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Old 06-27-2013, 02:40 PM   #11
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Leave it alone, those 4Vs love to rev anyway, let it breathe and go. And aren't you going to do an eaton swap anyway? At that point when you have the M112 cramming all that air into the cylinders the backpressure thing will be even more moot than it is meow.
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Old 06-27-2013, 03:21 PM   #12
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what is your opinion on offroad x pipe with M.J.L eliminator...
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Old 06-27-2013, 05:40 PM   #13
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what is your opinion on offroad x pipe with M.J.L eliminator...
MIL eliminator? That's what most people run on a mustang if they really want to open it up
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Old 06-27-2013, 05:49 PM   #14
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I'm referring to the off road x. Mil eliminator is just to make the CEL go off if you don't have a tune
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Old 06-27-2013, 09:08 PM   #15
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thank you
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