If you get a custom job from a muffler shop, make sure they have a mandrel bender. If not, there will be pinch points at every turn in the pipe, causing backpressure. Remember, your high-flow exhaust is only as big as the smallest point in the flow-through. Meaning a 2.5'' cat back with pinched pipes is probably closer to a 2''.lol i dunno man hes been one uppin his car for the longest... he might still have a big enough head. i am debating whether to order Pypes from slayer or to get the custom job done with flowmasters at the muffler shop... rougly around the same price... but when they say "custom" are the pipes of good quality or do they conjure up some spare crap and fashion the pipes themselves??