MINI2 - MINI Forum - View Single Post - Milltek Cat-Back and ANY Manifold Combination

ScottyBoy · Mar 13th, 2007, 02:30 PM

The Sports cat on a manifold is more than likely the best change on there for it is far less restrictive (just read the Janspeed manifold is 120cpsi from lohen) but the straight pipes 4 -1 have a larger bore and this is another main feature thats makes it alot more free flowing!
hear is a pic of both as you can see the Janspeed manifold pipes are far straighter.

As far as im aware the CAT should last as long as a normal CAT as long as the car is not running lean!
if its running lean then unburnt petrol will be sitting in the cat and will serverly damage it!

Mar 13th, 2007, 02:30 PM	#13
ScottyBoy Obsessive Car Cleaner OCC My Classifieds Join Date: Jul 2006 Location: Thornaby NE Local Time: 07:14 AM Posts: 2,875 Offline	The Sports cat on a manifold is more than likely the best change on there for it is far less restrictive (just read the Janspeed manifold is 120cpsi from lohen) but the straight pipes 4 -1 have a larger bore and this is another main feature thats makes it alot more free flowing! hear is a pic of both as you can see the Janspeed manifold pipes are far straighter. As far as im aware the CAT should last as long as a normal CAT as long as the car is not running lean! if its running lean then unburnt petrol will be sitting in the cat and will serverly damage it!