that is pathetic
going from stock exhaust to long tubes and full exhaust can add 30-40 on an ls1
most cars with lid and full exhaust put down 340-350s some in the 360s depending on what other boltons.
an 02-04 z06 with intake long tubes and x pipe and stock catback will generally put down 390 at the wheels
Long tubes are big on the 4valve, will take it to at least high 280s-300
I cant believe all these people in here are calling 98 cobras slow. your car stock ran high 14s-15s for god sakes and you can mod a cobra too
since he is replacing his motor, help him out with decision, he should get a mach 1 crate motor. they sell them used for a descent price.
with his current motors and a mach 1 long block popped in, he should trap 108-112