JustAnIlluzion

iTrader: (60)

are all the ls1, ls2, ls6 exhaust manifolds exactly the same?

LoudmouthLT1

iTrader: (2)

I believe the 00+ are supposed to flow better then the 98-99. I don't know if they have a larger diameter or what.

98z28chevy

Samething i hear 00+ flow better.

JasonWW

iTrader: (2)

The 98 and 99 are double walled tubular and pretty restrictive. The 00-02 are cast iron and flow better. I can't comment on cars other than the F-bodies, LS2 for example.

JonB

iTrader: (3)

The LS6 are different and do flow better than the 00+ f-bodies. Awhile back CHP did a comparision of ls1 manifolds(not sure of the year) ls6 and a set of 1 5/8 and 1 3/4 headers and the ls6's only flowed a little lower than the 1 5/8. I can't remember the numbers but it was's much.

RedHardSupra

iTrader: (1)

ok, so could i put a 01 header on a 99 (i already have air/egr gone anyway)

TAQuickness

iTrader: (28)

01 fbod header on a 99 fbod will fit. Should look a bit better with out the egr fittings too

JasonWW

iTrader: (2)

It's funny, I have a pair of later model cast manifolds in my garage that I was going to swap my 99 manifolds with. I was going to do it because the car was under warranty, but now that the warranty is over, I'm going to go straight to long tube headers.