LS1TAUTO

iTrader: (1)

How much power u think long tubes put to the ground on a4 ls1"s? I've heard ppl say it's close to about 15 horse and 20 tq to the ground is this true? Thanks

teke184

iTrader: (5)

15-20 hp is probably about average.

more if you tune it at the same time.

alot of that power gain is from removing the cats and restrictive ypipe.

Jon@Texas-Speed

iTrader: (18)

Yeah 15-20 to the ground depending on the car and header.

Jon

ripgtp97

iTrader: (2)

how about longtubes with high flow cats? Being in new york, we have to have them to pass emissions

jeepers_88

iTrader: (13)

Id say at least that. You wont regret them, they sound awesome and the difference in the car is bad ***. Youll really be surprised by how much they wake up the car.

allan808

iTrader: (3)

edelbrock has the stepped longtubes on here for $300 was $260 last week,there 1 3/4 to 1 7/8 stepped and merge to a 3 1/2 collector,you might be able to squeeze a few more hp with these then the supposed 1 3/4 headers..and youl have room to grow with these if you go bigger cubes later on..they got some hooker and pacesetters here that are about the same price but there 1 3/4 tubes..

heres the link to the edelbrock stepped headers...
https://ls1tech.com/forums/generatio...out-sales.html

https://ls1tech.com/forums/sponsor-s...orks-sale.html

https://ls1tech.com/forums/sponsor-s...-blow-out.html

MonmouthCtyLS7

iTrader: (6)

The same...wont gain much power through the cats.

teke184

iTrader: (5)

long tubes will still gain good power even with cats. if the cats are quality then they should only pull 5hp compared to no cats.

the manifolds are the main restriction

BriancWS6

iTrader: (18)

From complete stock exhaust to pacesetter long tubes, TSP ory, and a Hooker catback, I went from 321/331 to 336/349. After porting my throttle body and getting a tune, it jumped to 354/373.