I'm still confused with mine cause I still can't get the 5.9 sec. The lowest I got is 6.5 with ESP on.

I realized that adding 20 HP more ( Upsolute Chip, MagnaFlow Muffler and K&N filters ) is like adding a lawnmower speed in our Crossfire

By the way, does changing the muffler affect the chip program ? Maybe someone can ask Rene 'cause in another forum a chipped Merc loss the programming when he changed his spark plugs.