I'am planning on making my own fabricated catback, you see i'am buying a cheap muffler import cannister that is free flowing from some import shop for 230 bucks, and then i will get a muffler mechanic to fabricate 4inch to the cannister. Anybody else do this?? I dont have the money to spend on a name brand catback, so i decided to get one custom made. Has anybody done this? Oh by the way will the 4 inch make my car louder, i want the car ***** loud!!!!!!!!!!!