Exhaust

[BlackJack]

what's the most HP gaining setup from headers to tailpipe for my '03 3400 automatic? No jokes about throwing a snail in there, dont have the bucks for that upgrade YET.....heh

[FormulaNERD]

for more cost effective....

s&s headers, custom tubing, catco cat, flowmaster/magnaflow muffler

less cost effective
tog headers, custom/catco/slp or borla (if you can find the borla)

[Redog]

Headers boast 20 HP at the wheels and SLP cat back claims 10 to 12 HP gain

With the entire set up you looking at about 28 HP maybe more.

[FormulaNERD]

i'd say 20 hp max.... horsepower doenst "add up" like that.

the stock exhaust from the cat back isnt "maxed out" as far as flow is concerned until after 5000 rpms. so any "gains" arent reallly useable as far as everyday performance is concerned.

i'd only spend money on a cat back if you plan on going to the track, and/or want better sound.

ive got the ecotec. does my header add 20 hp or probably just 20 to 25 hp with header, cat back exhaust and intake?