Ricks99ls1

iTrader: (9)

I have a 99 formula ls1 with six speed manual, these are my mods slp lid , slp loudmouth stage 1 exhaust, and pace setter long tube headers, i was wondering what kinda horsepower, torque and quarter times i can expect. Also can anyone tell me how difficult it was to install there headers, what kinda troubles i can expect and easy install procedures, id really appreciate everyones help, and input, thank you very much. Ricky

5_02ls1

iTrader: (20)

stage 1 exhaust ????
most m6 cars with lid and cat back lay down 315-320ish rwhp and low 13s in the 1/4 at a good track close to sea level

BayAreaSS

iTrader: (10)

I think 330hp.

low 13's maybe high 12's with some driving

dans2k1ws6

Sorry,but what about my car what kind 1/4 times can expect
With my setup

BayAreaSS

iTrader: (10)

Very low 12's and maybe some high 11's with some traction and good driving.

orangeapeel

iTrader: (18)

Throw some tires on and they will be good for a mid 12.

777

iTrader: (21)

big stickies at the top of the page

https://ls1tech.com/forums/new-ls1-owners-newbie-tech/458711-general-et-hp-database-what-s-your-1-4-mile-time.html

black01_WS6

iTrader: (13)

one of the best mods you can do to a almost stock car is throw a good tire on the rear. I would say you are good for mid 13 to low 13's for a first time out. If you know how to throw the gears then you could be in the mid 12's

FLA02TA

iTrader: (5)

I run 13.0 flat at 108 with similar mods and a hand held tune. I'm a TC or tires away from 12's I guess. I hooked decent on the 13.0 run on street tires. A little wheel hop through 1st and none in 2nd up.

Can't help you with the headers. RevXtreme in Tampa did them and the guy made it look easy.

millersta

iTrader: (2)

i have an ls1/ls6 book that says most long tubes require the engine to be droped to install.

777

iTrader: (21)

You should try a poll to see how many people dropped their engines to install headers.

LS1IMPULSE

iTrader: (42)

1 vote for god no, thats alot of un-needed hassle to isntall LT's, jack the car up high enough to have room to manuver the headers into place, passenger side should pull out like nothing, driver side disconect the steering linkage and your golden.

moondoggy1302

I think when he said stage 1 he ment instead of the loud mouth II exhaust, but anyways, id say about 320-325 without a tune, get a tune and probably around 340, 1/4 anywhere from 12.9-13.4 depoending on driver