cat delete?

Xear0 · #1 (**permalink**) 03-15-2008, 11:24 AM

my cat on my 95 M3 has a nasty sounding rattle. car runs great, but that cat sounds like shit. thinking of doing a cat delete, im just a bit worried about how loud its gonna get. ware im at we dont have exhaust inspections and cops dont really care about how loud shit is. (u should hear some of the trucks here)

anyone have a video of an e36 with no cats, but a muffler on it? or have any experience with it?

M3-Zero · #2 (**permalink**) 03-15-2008, 08:57 PM

Not an E36 but I did a cat delete on a VW Jetta a few years back and could barely hear a difference with the muffler intact. Drove it that way for 3 years only adding the cat back once for smog inspection and had no problems. I'm not sure if this helps

James · #3 (**permalink**) 03-15-2008, 10:39 PM

http://www.youtube.com/v/K0eGbFfEgeA&hl

Loud and doesn't always sound great.

Gusagain · #4 (**permalink**) 03-16-2008, 06:18 AM

Loud isn't the main problem, the SMOG check is the main culprit. Check with your local inspection point and ask them about the requirements to pass.

Xear0 · #5 (**permalink**) 03-16-2008, 05:39 PM

Quote:

Originally Posted by James

http://www.youtube.com/v/K0eGbFfEgeA&hl

Loud and doesn't always sound great.

does that car have the cats removed with a exhaust on the end installed?

Xear0 · #6 (**permalink**) 03-16-2008, 05:39 PM

Quote:

Originally Posted by Gusagain

Loud isn't the main problem, the SMOG check is the main culprit. Check with your local inspection point and ask them about the requirements to pass.

lol, we dont have inspections here....at all.

92318is · #7 (**permalink**) 03-20-2008, 07:52 PM

I've never heard what a cat delete sounds like on an m3, but I don't have a cat on my eclipse, and when I put it back on for inspection I don't hear a big difference. The main difference I feel is in power. It's a bit louder, but cats aren't meant for sound level control, just emissions.

fairweatherpunk · #8 (**permalink**) 03-30-2008, 02:19 PM

Before anyone does a cat delete they really should head over to uuc's website and read about performance gain on cars with no cats. It's very informative.

USCG M3 · #9 (**permalink**) 05-05-2008, 08:48 PM

I would not do a cat delete, the reason is being it is a naturally aspirated motor it requires a cetain amount of back pressure, a muffler is usally not enough. That being said you will lose a good amount of torque. if anything just deal with the rattling and save up to buy some nice hi flow cats.

92318is · #10 (**permalink**) 05-06-2008, 04:45 PM

Putting in a straight pipe where the cat was will not decrease back pressure enough to hurt the engine, as long as the rest of the exhaust is intact.

USCG M3 · #11 (**permalink**) 05-07-2008, 10:18 PM

It will definatley lose torque. it will hurt nothing but when I did I noticed it. It did not seem to accelerate as fast. never had a chance to test it at a track, but it bad enough to the point I put them back on.

paulsaylee · #12 (**permalink**) 05-19-2008, 01:59 PM

Quote:

Originally Posted by Xear0

my cat on my 95 M3 has a nasty sounding rattle. car runs great, but that cat sounds like shit. thinking of doing a cat delete, im just a bit worried about how loud its gonna get. ware im at we dont have exhaust inspections and cops dont really care about how loud shit is. (u should hear some of the trucks here)

anyone have a video of an e36 with no cats, but a muffler on it? or have any experience with it?

i had that experience also, but after i got my catback and headers it wasnt there no more....a straight pipe does sound good sometimes,but sometimes it might even make it sound bad...or you should just replace it with an oem..thats never bad..