gbrett

I have a 2000 ls1 from a firebird in a 1991 firebird looking to do some bolt ons for better performance. The engine has no cats no egr no air and a specter air intake other than that its stock. So what would you guys suggest the car is daily driven the performance is good but it can always be better.

Trans24am

theres a sticky for this , theres no such thing as "best bolt ons"

ULTIMATEORANGESS

iTrader: (4)

what trans does your car have?

'02 WS6

iTrader: (73)

U/D, pulley, lt headers, y or x pipe, catback or true duals, p/p throttle body, ls6 intake, tune, gears, stall (if a4), and tires.

MonmouthCtyLS7

iTrader: (6)

That about sums it up

gbrett

it has the t56 and 3.42 gears. I was thinking of the ls6 intake what kind of gains should I expect from that or would I be better off with an aftermarket manifold?

Paul Bell

iTrader: (9)

The single bolt on that gains the most power is a full exhaust and the required tune. Headers, high flow cats, high flow cat-back system.

All the other bolt-ons might just add just a few HP each, depending on the engine running condition and tune.

gbrett

since its in a 91 there is no bolt on exhaust it has no cats the exhaust is dual all the way back to the muffler and its a high flow muffler