True duals with or w/o cat HELP!!!

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Jul 10, 2008 | 09:42 PM

94TRANS

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From: Lewisville, Texas

True duals with or w/o cat HELP!!!

ok so the car is going to be on its way to the exhaust shop in about a week (99 z28), but am having trouble deciding if i should delete the cats or not? iv herd that no cats with a y pipe can make it sound more raspy and not as good but also herd that true duals dont realy have any rasp so would cats or no cats really make a sound diference? also would no cats increase the HP by much?
i have Dynatech LT's with high flow cats right now. keep them or no?

after much thinking i am going with 3" short powersticks and X pipe with 2.5" pipeing run out the back.
thanks for any input.
-Kris

Jul 10, 2008 | 10:28 PM

01ssreda4

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From: Turnin' Wrenches Infractions: 005

not worried about emissions?

Jul 10, 2008 | 10:29 PM

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Quote:

Originally Posted by 01ssreda4

not worried about emissions?

nahh, i have hookups for inspections

Jul 11, 2008 | 06:11 AM

magius231

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rasp depends highly on the muffler used. I don't know much about the powersticks, but any open chambered (i.e. non fiberglass packed) muffler is going to sound raspy with an X-pipe. You can minimize it somewhat with some cats, but it will still be there. If you are considering an open muffler like this, go with an H-pipe, you will be happier with the sound. The performance difference between the X and H pipes is more a matter of RPM range than actual power anyway (H-pipes tend to be stronger in the midrange whereas X-pipes like higher RPM). Any exhaust, dual or otherwise can be raspy, ask the Mustang guys

Jul 11, 2008 | 08:26 AM

HavATampa

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I've had my H-pipe duals with and without cats, I went back with the cats just to tone it down a little and control the sound somewhat. It's all a matter of personal preference. Some people like it stupid loud and others want it deep and refined. That's why there are so many different types of mufflers but cats do make a small difference in the overall sound. The best system to have is a way to have both worlds. Whether it be cutouts or a way to easily unbolt the back 1/2 of the exhaust system and just have small mufflers with turndowns before the axle. My system uses 2 small cats, h-pipe to 2 Powersticks before the axle and flanged to pipes over the axle to 2 full size Dynomaxx mufflers and then out the back.

Jul 11, 2008 | 09:34 AM

turbowhistle86

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this is a true dual system with Hooker LT's, custom 2.5" H pipe, Magnaflow race cats, 2.5" medium powersticks, run over the axle and out the back......hope it helps.

http://s181.photobucket.com/albums/x...t=DSCI0022.flv

Jul 11, 2008 | 04:58 PM

King Nothing

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i have true duals with a H and no cats . . . the LM1's before the axle are pretty loud but i love it personal preference

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Jul 11, 2008 | 06:25 PM

94TRANS

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From: Lewisville, Texas

update: going to order the Medium powersticks for the deeper more throughty sound

and am most likely going to keep the cats

Jul 16, 2008 | 11:42 PM

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integraxtc

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how long are the medium sticks?

I'm wanting to get the longest sticks possible b4 the axle, and then extend it out the back.

I'm keeping my cats too.

Jul 17, 2008 | 12:04 AM

#11

94TRANS

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From: Lewisville, Texas

you can look up the sizes here, dont know off the top of my head?
http://www.eadperformance.com/catalo...185467ec5083dc

Jul 17, 2008 | 01:06 AM

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dreemurY2K SS

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well i would put some hi flow cats....
were are u gettin the X pipe...i want to do an off road 3 "x pipe with
dual slp's an hi flow cats

let me know thanx nice lookin z28

Jul 17, 2008 | 01:08 AM

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94TRANS

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Quote:

Originally Posted by dreemurY2K SS

well i would put some hi flow cats....
were are u gettin the X pipe...i want to do an off road 3 "x pipe with
dual slp's an hi flow cats

let me know thanx nice lookin z28

thanks man, i am just having a custom X pipe made at the shop most likely hard to find one online?