this isnt a ford. if your gonna go the f/i route go with a 2 3/4 inch pipe. n/a go no bigger than 2 1/2 inch. if your not planning on turboing soon buy a smaller pipe so you dont lose back pressure and get a power loss.but to answer your questionspoon n1apexi ws2greddytanabe medallionhks hi-powerskunk2 mega power