Originally Posted by G37sHKS

Hey Kastley, after million of search.. I found out why the drop at 2k-3k RPM..

its not about the stock exhaust, its about the Y pipes. and its not because its cheap..

actually all the Y pipes that have 2.5" and 3" merge will have high gains from mid to top but drop in low end...

here some examples..


so wow.. gratz on ur 40$ Y pipes.. cheap Y pipe ftw