Anyone run no catback?
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TECH Apprentice
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Joined: Oct 2004
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From: Sugar Land, TX
Anyone run no catback? I'm running a stock exhaust system (with stock manifolds and all) with a cutout. I leave my cutout open all the time, and I've gotten so used to the sound that I don't think it's too loud anymore.
I was just wondering if anyone here has hacked off their catback system before and just dumped the I-pipe before the axle? Does it just sound like a cutout, but louder? Would there be too little back pressure? I figure I could also save a few pounds this way.
Edit: Sorry, please move to the external engine forum.
I was just wondering if anyone here has hacked off their catback system before and just dumped the I-pipe before the axle? Does it just sound like a cutout, but louder? Would there be too little back pressure? I figure I could also save a few pounds this way.
Edit: Sorry, please move to the external engine forum.
it rattles the **** outta the car. i ran open headers one time on the street in a m6. bad idea. even open y was horrible. im making an x pipe for my 95 now, and gonna dump it right b4 the axle. should sound good
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You don't want back pressure, having back pressure for torque is a myth. You need to concern yourself with exhaust scavenging. That may reduce your torque, increasing back pressure will not increase the torque.
As said, many run muffler-less even with LTs. Loud and annoying, unless drag only.
As said, many run muffler-less even with LTs. Loud and annoying, unless drag only.
I have the adjustable borla cat back with no plate in it.its pretty loud.After i get headers and a ORY i was wanting to put a bullet style muffler with a turn-down right off the Y.saw a SOM z28 at the LSX shoot out with the same set up and it had a pretty nice tone
Staging Lane
Joined: Jun 2008
Posts: 60
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I ran without a catback with just a 3" ORY Y pipe and 3" I pipe with a turndown at the end and i had no rattling in the car what so ever. Its not to loud at all. Im currently running no mufflers or even a Y pipe just turndowns off of where the Y pipe bolts up. It is much much louder then the no catback setup.With the setup now i get alittle bit of rattling at 1200-1800 rpms, there is none at idle or above 2k rpms. There is still quite a bit of backpressure from the stock manifolds and the emissions exhaust off of the manifolds plus you dont need backpressure which is a whole diffrent arguement. I weighed the stock catback system and you cut off about 45 pounds, i cut about 90-100 pounds off just by running without a exhaust 
You dont think the exhaust weighs much but intell you cut it off and pick it up its like holy sh*t!
You dont think the exhaust weighs much but intell you cut it off and pick it up its like holy sh*t! 
Staging Lane
Joined: Oct 2008
Posts: 54
Likes: 0
I have the adjustable borla cat back with no plate in it.its pretty loud.After i get headers and a ORY i was wanting to put a bullet style muffler with a turn-down right off the Y.saw a SOM z28 at the LSX shoot out with the same set up and it had a pretty nice tone
i daily drove mine for 4 years with the cutout constantly open, my cutout was located right after the y pipe merged. about 6 months ago i bought a vw dd so i took all the exhaust off after the y pipe. It really wasnt any louder but the tone difference was night and day. it no longer has a high frequency tinny sound that the cutout produced and it no longer sounds like im getting on it durring part throttle crusing. adding a turndown to the open y pipe made a slight difference but more importantly its keeping those exhaust gases off my dana and driveshaft. Ive got video from when i was running the cutout, i can shoot a quick vid sometime of the new exhaust setup if anyone would like
When I first bought my 2000 A4 Z28 it was stone stock. I put a SLP lid on it & SLP Loudmouth catback. I didn't think it was loud enough, so I removed it & sold it and just left it open at the Y pipe (stock manifolds & catted stock Y) And it seemed like it ran better than it did with the SLP loudmouth. With just a SLP lid & Open stock Y pipe (2.73 gears) the car went 13.28 @ 107
