Cat-Back exhaust, Will it help?

**98_Z28_ls1** · 06-17-2007, 04:29 PM

I have a 1998 Z28 with a few induction mods and i was going to get a dyno tune with the little money i have left. i was wondering would it be better to buy the SLP LM 1 instead of the tune? would exhaust alone add hp and tq? if so how much? Ty for any replies

**BlackLT1Z28** · 06-17-2007, 04:55 PM

With what you have, its definately not worth paying for a tune, unless that is all you are going to be doing to your car (which I doubt). Go with the exhaust. And yes, you will see hp and tq gains with the catback, plus the sound is never a bad thing.

**98_Z28_ls1** · 06-17-2007, 05:29 PM

Thanks 4 ur reply. Will the increase be easily noticed? What actual #'s do U think it will add. Ty

**BlackLT1Z28** · 06-17-2007, 05:35 PM

I doubt you'll really feel it on the road. You might have better throttle response, but you won't sit there and say, "Damn, I can feel the difference". But it does free up hp. Typical gains for a catback at anywhere from 5-10rwhp. Most catbacks pretty much see the same gains, except for flowmaster.

**98_Z28_ls1** · 06-17-2007, 05:40 PM

Ok. Thanks. If i can afford it after installation and everything i will definatly go with the exhaust. the only reason i wanted a tune in the first place is b/c the SES light came on. Chevrolet says it is running lean b/c it is not tuned to run with those parts.(SLP lid, SLP MAF, SLP intake elbow)

**whiteLS1TA** · 06-17-2007, 06:03 PM

Originally Posted by 98_Z28_ls1

Ok. Thanks. If i can afford it after installation and everything i will definatly go with the exhaust. the only reason i wanted a tune in the first place is b/c the SES light came on. Chevrolet says it is running lean b/c it is not tuned to run with those parts.(SLP lid, SLP MAF, SLP intake elbow)

man when i first got my SLP LM2 put on my 2001 trans am i felt a little bit more throttle response. but the thing i dont get is why different exhaust brands cost more then others?

**F-Body Man** · 06-18-2007, 10:41 AM

Originally Posted by whiteLS1TA

man when i first got my SLP LM2 put on my 2001 trans am i felt a little bit more throttle response. but the thing i dont get is why different exhaust brands cost more then others?

The reason Different brands cost different prices is for - 1. Quality, 2. Sound, 3. Looks. Hope that helps. Brad

**SSwt00SS** · 06-18-2007, 11:08 AM

personally i would sell your SLP MAF since your stock MAF can handle 500hp. i had the SLP LM and with stock exhaust it sounded great...

why you are throwing an SES light and the code reads :too lean, is a new one. most people have never said that the SES is tripped after doing just basic induction mods like what you have done to date.

also, with what you have done, you do not need a tune at this time...

**kyemt** · 06-18-2007, 03:40 PM

my gto has been throwing a ses light, it comes and goes so im thinking bout selling it the slp mass air that is

**Heartbreak1** · 06-18-2007, 08:39 PM

Aftermarket MAF's, especially from SLP are garbage. Do not use them, they are a waste of cash. My friend with a 396 '94 T/A had one and dumped it because it was screwing with his car as well.