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Old 03-13-2011, 03:28 PM   #1
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Catted vs Non catted

Ok so I've been debating for a while now whether to go with high flow cats or not and I think I'm going to go without cats. Is there a big difference between both and do you get a better hp gains without cats? A lot of people say to go without cats and that it's a lot better.
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Old 03-13-2011, 03:32 PM   #2
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Depends on the year of your car. But you do get more hp without them for sure and it's much louder. But I have heard you need a tune after if you go catless. I have a 1995 so it was no problem for me
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Old 03-13-2011, 04:46 PM   #3
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Re: Catted vs Non catted

It's an 06 GT and I already have an SCT Tuner so that wouldn't be a problem. Should I go catless?
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Old 03-13-2011, 04:49 PM   #4
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What about my 2000 mustang v6 is it safe to have cattless for a while till I get my tuner?
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Old 03-13-2011, 05:05 PM   #5
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Re: Catted vs Non catted

do you have emmisons testing?
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Old 03-13-2011, 05:13 PM   #6
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Ya but I know someone that can pass it for me
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Old 03-13-2011, 05:15 PM   #7
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Go catless for sure man
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Old 03-13-2011, 05:20 PM   #8
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It just depends where you live. If you can get away with no cats and still pass inspection, then there's no point in having them.
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Old 03-13-2011, 05:23 PM   #9
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Re: Catted vs Non catted

what have you done to the car so far?
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Old 03-13-2011, 05:36 PM   #10
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I have a CAI, SCT race tune, and flowmaster axle backs. But I want to get an offroad h pipe with Mac axel backs. And then eventually headers.
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Old 03-13-2011, 05:38 PM   #11
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Quote:
Originally Posted by Stang23
I have a CAI, SCT race tune, and flowmaster axle backs. But I want to get an offroad h pipe with Mac axel backs. And then eventually headers.
Great choice. Mac mufflers sound great.
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Old 03-13-2011, 05:44 PM   #12
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Ya do you think they would sound better than the stingers because that's what I was debating between
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Old 03-13-2011, 05:54 PM   #13
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Ya do you think they would sound better than the stingers because that's what I was debating between
I think they do. But I hate borla. I would be running Mac right now but I shouldn't run a chambered muffler on mine. Had Mac on my 96gt and my 91notch. You won't be disappointed with them.
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Old 03-13-2011, 05:59 PM   #14
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If you already have a cat back system that is in good shape, just get the Mac replacement mufflers. Save a lot of money. Get em clamped or welded in. Tail pipes are tail pipes.
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Old 03-13-2011, 06:58 PM   #15
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Quote:
Originally Posted by Alscobra
If you already have a cat back system that is in good shape, just get the Mac replacement mufflers. Save a lot of money. Get em clamped or welded in. Tail pipes are tail pipes.
It's the stock catback right now with mufflers
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Old 03-13-2011, 08:55 PM   #16
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I also like the bassani mufflers as well. I think my final decision will be between Mac and bassani.
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Old 03-13-2011, 09:32 PM   #17
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I also like the bassani mufflers as well. I think my final decision will be between Mac and bassani.
I am really biased. I got bassani right now. I hate em. I haven't heard a stainless muffler I like yet. Welded aluminized all the way. On a gt, flowermaster 2 chamber or Mac. I'm trying dynomax ultraflows next just because they are straight thru mufflers. Can't sound any worst than the bassani.
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Old 03-13-2011, 09:44 PM   #18
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Re: Catted vs Non catted

Really? Below is a link of the setup that i want. Its an offroad h pipe with bassani mufflers and i think it sounds good. It has that deep muscle car sound that i want. What do you think?
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Old 03-13-2011, 09:51 PM   #19
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Really? Below is a link of the setup that i want. Its an offroad h pipe with bassani mufflers and i think it sounds good. It has that deep muscle car sound that i want. What do you think?
All I can tell you is I hate my bassani. I think welded steel sounds better than stainless. An yes it makes a difference. Just my opinion though.
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Old 03-14-2011, 08:42 AM   #20
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Ok thanks
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Old 03-14-2011, 08:57 AM   #21
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Re: Catted vs Non catted

if you go high flow cats then the horsepower loss is minimal ....
if your going factory cats then an off road pipe is probably worth 4 or 5 horse
stick with high flow cats and keep your emissions clean ,SAVE THE PLANET
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Old 03-14-2011, 10:00 AM   #22
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Ya I think I'm still gunna go with an offroad h pipe with stingers. It sounds pretty good
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Old 03-14-2011, 04:10 PM   #23
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Quote:
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I have a CAI, SCT race tune, and flowmaster axle backs. But I want to get an offroad h pipe with Mac axel backs. And then eventually headers.
K...if you are gonna install long tubes hold off on doing any exhaust work til they are in then do the exhaust. Otherwise your gonna pay twice

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Old 03-14-2011, 04:18 PM   #24
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Ya I've been thinking about that for a while but I don't think I'm gunna do long tubes. If anything I would probably just end up doing shortys.
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Old 03-14-2011, 04:28 PM   #25
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Ya I've been thinking about that for a while but I don't think I'm gunna do long tubes. If anything I would probably just end up doing shortys.
Shortys give very little gain. 5 hp on a 2v. Maybe 10 on a 3v. The stock manifolds flow really well so on these cars it's long tubes or it really isn't worth the money. Long tubes and intake on a 3v is good for about 30-35 hp

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Old 03-14-2011, 04:33 PM   #26
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Ya but it's just so loud with longtubes and for me it would probably get old pretty quick
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Old 03-14-2011, 10:55 PM   #27
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Re: Catted vs Non catted

I dynoed my car on the same dyno but different days and with the mods at the time with different midpipes, these were the numbers:
Stock catted H-298 RWHP/308 RWTQ
O/R Prochamber 302 RWHP/305 RWTQ (I could feel a loss of tq down low)
Prochamber w/hi-flow cats 305 RWHP/311 RWTQ.
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Old 03-14-2011, 11:06 PM   #28
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Originally Posted by gmantheman
I dynoed my car on the same dyno but different days and with the mods at the time with different midpipes, these were the numbers:
Stock catted H-298 RWHP/308 RWTQ
O/R Prochamber 302 RWHP/305 RWTQ (I could feel a loss of tq down low)
Prochamber w/hi-flow cats 305 RWHP/311 RWTQ.
So Its better with the hi flow cats? And what other mods do you have?
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Old 03-15-2011, 09:59 PM   #29
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Re: Catted vs Non catted

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So Its better with the hi flow cats? And what other mods do you have?
Mods at the time that would affect dyno numbers were: Steeda UDP, JLT intake and Bama 91 race and 91 tq tune. The 91race and 91 tq made the same numbers. Now I have Comp NSR Stage 2 cams and CMDP.

When I added the hi-flows, my low end tq felt like it came back.
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Old 03-15-2011, 10:08 PM   #30
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Hmm ya now I don't know whether to spend more and get high flows or just get the offroad prochamber. I mean 5 to 6 hp difference between the two is pretty much not even noticeable. I'll have to think a little more on it. But there's also a 91tq tune? cuz I have the 91 race tune and I love it but I didnt know there was a tq tune.
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Old 03-15-2011, 11:04 PM   #31
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Re: Catted vs Non catted

Since Bama merged with American muscle, the tq tune is now called the street tune. When I had the o/r prochamber and magnapacks, I may have had an exhaust leak because at mid to upper RPMs it was raspy and would trumpet. I had hi-flow cats welded in mainly for the smell. I was a little nervous driving around cops. When I had the cats installed, the sound improved. It was deeper and no raspniess nor trumpeting. The volume was reduced but only a little.
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Old 03-15-2011, 11:33 PM   #32
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Ohh I see. Is the exhaust smell really noticeable without cats?
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Old 03-16-2011, 12:09 AM   #33
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Ohh I see. Is the exhaust smell really noticeable without cats?
Somewhat yes. The cats burn the exhaust gasses at a high temp to completely finish the burn

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Old 03-16-2011, 12:13 AM   #34
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Re: Catted vs Non catted

I don't mind it. I have Mac shorties going to an H pipe back to flowmasters that are dumped at the axle. No cats for me thanks.
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Old 03-16-2011, 12:21 AM   #35
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So it wouldnt be as bad to where the cops would notice it or anything right?
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