i took a dyno with shortys and never got around to taking a dyno after installing longtubes but i know from the butt dyno and my tires barking at the line i gained more power. With shortys if i hit WOT from a light it would just go. after longtubes i hit WOT from a light and barked the tires. and it sounds better too
Those look nice thoe and if you got um for free thats good. wish i woulda found this site before i bought headers.