It's time for me to do my exhaust and what i'm thinking is: factory Dp - corksport racepipe (assuming it's 3in) - 3in piping - 2, 5x8 oval magnaflow race series mufflers (3in inlet). but i'm stuck on the size outlet/tip? i don't want to reduce back down to 2.5 and they have 3.5in and 4in tips available on their mufflers. so will 4in work if i remove the chrome fake exhaust shrouds? or will i end up banging it around back there and melt my plastic?