awesome, thanks for the good info. My header came with like an orp/flexpipe in one. It's that M2 header on ebay. http://www.ebay.com/itm/M2-HEADER-FO...ccccf2&vxp=mtr
So I'm thinkin about goin with the 14" resonator like the one on the first link of Terry's post. Think that should bolt up right? Also if the flex is 2.5" I would also get the 2.5" res or 2.25"?
DD: 2003 Ford Focus ZX5-65mm TB, Intake, Long Tube Header, 2.5" exhaust, UDP, Tom's Tune. Almost 200k miles and still running strong!