it should get you about 12-15rwhp. i know it dont sound that great, but it is not easy to ad power to these cars. i got the plentum and t/b mod and was dynoed afterward so i have a good ides what you will get from that.
shortie headers are a pain to install for their gains, but if u live in CA they're a must, although your going to have some leak probs im guessing cuz the steel expands more than the stock cast iron and will entually become loose from swelling and then shrinking or blow a header gasket from expanding too much. Ceramic is the way to go, tho i havent heard too much probs w/ plain steel on our 4.6's
My guess is 11-13 if NPI and 13-16 PI to the ground
yaa but i heard that long tube headers can really mess up your engine rather then the shorties and youll saying that ceramic will be better but also chrome looks better but i rather be safe then sorry you know and i do have a mid pipe its a bbk o/r xpipe and i love it lol
yaa but i heard that long tube headers can really mess up your engine rather then the shorties and youll saying that ceramic will be better but also chrome looks better but i rather be safe then sorry you know and i do have a mid pipe its a bbk o/r xpipe and i love it lol