Im wanting to do a svt header swap on my zx3 but was wondering if u can only use certain cat backs or if it fixs zx3 im ok. Mainly looking at the obx type r. I knida like the look and like the sound it produces.
Most 'cat backs' are actually a flexpipe back on the Focus.
From the flexpipe back the SVT is the same as the ZX3.
It's from the header to the flexpipe where the differences are. If using a SVT header you'll need a SVT cat/offroad pipe and SVT flexpipe. If using a Zetec header you need a zetec flexpipe only (is no room for a cat).
BTW, the EGR fitting for the OBX-R Header was a pain in the ass to find, and you will only find it in Brass. Which is holding up well.. I bought a Mandreal 2.5" Flexpipe, and I have a 2.5" exhaust that dumps after the rear axle. My car is stupid loud though, I need to add a muffler. I am catless.