4 4DRHTRD New member Jul 10, 2014 #21 No 3" on these! I made 550 on stock exhaust on Flex with downpipes and 600HP on downpipes with cutout open on stock exhaust with upgraded stock turbos. Even further clarity on EcoPowerParts CATTED downpipes - can pass emissions and haul ass....
No 3" on these! I made 550 on stock exhaust on Flex with downpipes and 600HP on downpipes with cutout open on stock exhaust with upgraded stock turbos. Even further clarity on EcoPowerParts CATTED downpipes - can pass emissions and haul ass....
