ok so here it is. my buddy has an older impreza that we tore down and we are putting a stock wrx turbo setup on it. and he bought this monster 4" bell mouth downpipe. well its looking like the clearances arent going to be right for this downpipe to work on his car so we are going to make our own to fit in there. anyways my question. this is a wrx downpipe. from what I understand it will bolt right onto the STi. so if I were to bolt this bad boy on my sti would I see any increases in power without loosing my stock exhaust. my buddy is willing to sell it to me pretty cheap and I would go ahead and do it. but I dont want to worry about boost creep issues as of right now I will be getting a ebc a little later on. but I am really waiting to get all of my guages in, and the new txs piggyback before I go into messing with the motor. I just figured if I could get away with this downpipe for now it would be great. so any info would be greatly appreciated!!