I had a mild steel ram horn one, I should of gone stainless really Keith at Zisco knocks out some top quality kit, I was just being a cheap skate at the time! Improved my spool by a couple of hundred rpm, sounded better and the ass dyno agreed that it helped! With that, a Zep ECU, a decat, exhaust, relocated filter and a bar of boost I ran a 14.7 1/4 mile at Santa pod on ditch finders!