1LowLS

Right now my exhaust piping is either 2.25 or 2.5(I cant remember,its customs bent).It sounds pretty good(Magnaflow resonator to a OBX 3 inch in muffler) but has a tiny bit of rasp until about 4300rpm.If I do 3 inch piping,would that help get rid of the rasp at all,stay the same or help eliminate it.I'm gonna upgrade the piping to 3 inch anyways.I was just curious on your thoughts.Thanks in advance
Steve

06_cobalt

You could look at my sticky in the general section. There is an article at the top and I didn't read all the way through it may be some help.

night_throne

iTrader: (1)

2.5 inches tops until u go boosted or u will actually lose performance. could try a different muffler or such imo

Cobalt08LS

iTrader: (15)

3 inch NA will be really raspy. try a diff muffler. maby a borla. my gmpp exhaust and zzp downpipe sounds awesome

1LowLS

I am boosted
I am supercharged 2.2.

Spanky's Monkey

iTrader: (6)

3 inch free up some power, better sound and the big tips look good.

1LowLS

My current tip is 5 inch I like em big as well I'm gonna keep my muffler because it's 3 inch inlet and core.Just the catback piping is what I'm worried about here.

05Slowline

iTrader: (2)

going to sound louder and s/c 4 cyl sound like **** unless you have a cat no need for 3" plenty of people making much more power on less

1LowLS

Maybe I'll swap to 3 inch from the magnaflow back to the muffler and add another resonator right before the muffler to tone it down a bit.hmmm decisions.

06_cobalt

Cat if you don't have it and resonators.

1LowLS

Cats staying off.I gained a lot from it being removed.I think I'm pretty set on doing 3 inch from the magnaflow resonator to the muffler with a added 12 inch resonator.It's not a whole lot of rasp in it.just a tiny bit in the mid range RPM's.Thanks for the advice.

06_cobalt

Well if you gained more power can't knock you for leaving it off. But the resonator should really help if not eliminate the rasp all together. Btw how much did you gain by leaving the cat off?

1LowLS

I can't really give you a dyno comparison.Hell I was NA when it got pulled off but they normally say around 10 hp difference.All I know is exact same track conditions I went from a 15.65(with cat NA) to a 15.40(no cat NA).I felt it on the butt dyno as well.I'm hoping a small resonator and 3 inch piping will help.If not,I'll deal with it lol.

My fastest ET to date is 13.7 @ 101 mph(2 psi boost leak and a "okay" tune and a bad H/E pump)Now everythings running much much better

05Slowline

iTrader: (2)

ricer math at it's finest

cmatthewb101

iTrader: (4)

06_cobalt

Damn if you gained .25 at the track sounds like it was well worth it.

1LowLS

Yezzer

These were consistent times as well on both NA runs.Was running 15.6's all night with cat NA.
Then was running 15.4's all night no cat NA.Thats why I stand by these times.If it was just one time on each run then I'd be more iffy on it but I def. felt alot more top end when I pulled it off.I've never had a cat SC so couldn't say the difference with a FI car.

I love when people call me a ricer hilarious.

05Slowline

iTrader: (2)

nah not ricer

1LowLS

Right lol

BlackCobalt707

iTrader: (5)

i got a SS/TC exhaust for ya. it has a aftermarket resonator and megan racing muffler

06_cobalt

Won't bolt up to a 2.2 downpipe

1LowLS

This^^ although I dont have a lower flange on my exhaust anyway but I'll just go get it custom made again for super cheap. Thank you though,

BlackCobalt707

iTrader: (5)

actually yes it will because it is flanged for the 2.2, 2.4 and 2.0 SC

i wouldnt try to sell someone something that i know didnt work for their car, im not shady like that lol

i had this cat back on my 2.2 with a 3" catless downpipe and it sounded amazing. vids of it is on my youtube page under "blackcobalt707"

06_cobalt

Well you never know about some people these days lol

BlackCobalt707

iTrader: (5)

true. but even then its as simple as chopping off a old flange and welding on a new one