My buddy has a wrr fully stock.
He's bought an fmf programmer, and is waiting patiently for the rest of the exhaust to muster.
Anywho, I suggested we try my stock muffler with "the" free mods, since he's attached to his only muffler...untill the full exhaust comes.
But for the life of me, I can't find any good posts/sticks on the free efforts, if ya know what I mean...
Could I get a link?...or advice somewhere?