ok two questions

1. how much HP does installing headers add to your car?
2. whats the difference in longtube and shorty headers?

Average gains are 20 or less to the rear wheels. The stock log style cast headers flow fairly well.

Long tubes gain more hp due to less restriction yet shorties give more torque due to equal length and better scavenging charecteristics.

Awesome thank u

longtubes FTW, but get the right ones :p

Headers are nice and give ya the sound of more ponies under the hood, but save your $$$'s and go for cams or intake headers.