i just installed rip's 4" dual exhaust without da muffler and spool up is unbelievable, just on the drive home a shift that would of hit 10-15# of boost hits 20 or more, it also gained about 4 pounds on the top end i can almost peg my 30# gauge where 25# was about the max, gotta get a 3k gsk something fierce now, was stock muffler and gutted kitty
#ad

