^^^ I'm not familiar with all the MD exhaust configurations - is it basically just moving the cats farther downstream? I'm not so sure there would be a worthwhile gain to going through that trouble...

Seems to me if you're gonna run HFC there is no point is using test pipes... if you are using test pipes, it's not much trouble to swap to OEM cats once every two years.

Maybe I'm still missing something

 

A vortech guy went from art pipes to xyz with resontated pipe to art pipes to xyz to cat and gained something like 20-30 whp.

http://my350z.com/forum/forced-induc...g-results.html

also

http://my350z.com/forum/intake-exhau...k-for-n-a.html

 

Oops sorry... I'm going vortech soon so accidentally bumped the wrong thread to get some mula for the vortech... haha... my bad