shorties will help a little but on the LS series motors, the stock manifolds flow about as much as shorties do. if you can, long tubes are the way to go.

from what ive read shorties will give 5-7hp, whereas long tubes can give you up to 20-25hp depending on motor.

 

wow but i really wanna feal the difference not hear it idk i head that american racing makes a set of headers that are 1,000 and so does magnaflow but that is just to much money and i also heard that the obx long tubes arent emmison leagal so idk if i will pass inspection

 

ahh who needs inspections. Sometimes we just have to move to another state.

 

not sure if you know of the site, seem o have prtty good deals, rpmoutlet.com has longtube headers, for 550 also comes with a y pipe and connects to the factory cats, i emailed them to ask if they work for 4x4's