Originally Posted by M3DCTBT
I hold one of the higher whp charts at 407.7whp along with jonmartin at 407whp and we used modified stock x pipes. My car even hadPeople can preach all they want about x designs and pipe diameter but ive yet to see it translate on the dyno sheet.
Ive since put on a full gintani true dual x pipe but that is for the great exotic sound more then the performance.
Thanks for chiming in. What were your mods when you put down 407? Were your secondary cats removed as well? Did you gain anything with the gintani?