indigo28

iTrader: (2)

the car is a 1999 automatic z28....usually what kind of gains can i expect from adding some pacesetter long tubes, and ory? does a different brand really make a differene if they all serve the same purpose? i know the quality on some are better but what kinda numbers can i expect? only mod on the car is slp loudmouth catback, no cats

Tainted

iTrader: (9)

well kooks and QTP have a slight hp advantage but not enough to really matter. with LT, ORY and a tune expect around 40ish

FU_I_AM_UltraZ

iTrader: (20)

sure they same purpose, but....
the only effects from exhaust systems are:
1. diameter, for stock LS1 with bolt-ons, i wouldn't go larger than 3 inch system.

2. bends in pipes, smoother the better.

3. cats. having a complete after market exhaust with LTs, hi flow cats give you the proper backpressure needed for a stock bolt-on LS1. if you've upgraded your cam and/or heads and don't have to worry about inspection, then go with an ORY.

for an A4 LS1 tuned, you'll gain about 35 rwhp.

lsx24

iTrader: (45)

You'll gain about 30 rwhp with headers and ORY. Most all headers will dyno close to each other, the difference in price is mainly the material they are made out of: stainless steel or not stainless steel.

staringback05

iTrader: (8)

from headers to a GOOD flowing exhaust you might be looking at a 20-30 gain

orangeapeel

iTrader: (18)

I will be honest. I think you will break 310rwhp...barely.

indigo28

iTrader: (2)

310 HORSEPOWER REALLY? LOL OK

mike#9

iTrader: (3)

Well considering he has a 98...and unless he upgraded......he does not have a LS6 intake.

310 may be a little low....but I don't think a ton more. I bet maybe 20-30 hp.