9D4Z28

my gmmg catback came in today, does anyone know how much hp i will gain from a gmmg catback on a stock 94 z28 ?

RamAir95TA

iTrader: (2)

Maybe 8whp.

djjab57

iTrader: (17)

But it will sound like more !

trippinholyman

I thought the general consensus for cat-backs was 10-20 rwhp?

I know after I installed my Loudmouth, the car threw me back in the seat. I would wager, maybe almost 15 rwhp! But that's sotp dyno, dunno what you would get on a real dyno...

harner

iTrader: (16)

I'd say maybe 5, it'll sound good though!

94Z28-MSTGKLR

iTrader: (20)

My GMMG was the first thing I did to mine when it was stock and to be honest, the only difference I seen was a big drop in my average mpg and the amazing sounds of "bad ***" pouring out the tail pipes!!!

za355tx

iTrader: (108)

A 3 inch catback over a stock catback should yield about 10 or so HP. A tune alone would probably get you more but if you were to do a good cold air setup with a 3 inch exhaust and a tune you'd be looking at 25-30 hp gain. Just info for you.

dream69

Yeah that GMMG is what I want to eventually get for my Z28. Every video clip I've seen is amazing. Let us know what you think when it's installed! Congrats!

hitmanws6

iTrader: (20)

roughly 10 if you are stock. more if you are modded. i need to get to a dyno soon, see what im putting down

krill

But you will love the sound! Probably the best mod I've done