Hey guys, im from the Pennsylvania USA, so not to many knowledgeble people on R's over here but hopefully u guys can help. Im gonna get a friend to custom tig me a 3 inch dump pipe from the turbo all the way to the cat. I just wanted to know when he makes it are there any tricks to sizing it up and gettin the most out of a relatively stock motor (intake, stage 4 clutch, bov)? should he split the outlet into 2 parts, wastegate and dump? Is a piece of flex pipe necessary for vibrations? should it be bigger than 3 inch? Whatever help you can give me would be greatly appreciated! Thanks