2.5" Standard Cat High Flow Modification

Mark Fish Motorsport modifies the standard 200cpsi cat to allow for greater flow. The standard cat is very restrictive at the cat to centre section join.

First the centre section join was cut off –



Then the cat join was cut off to open the cat up to a 2.5" exit -



The original join is very restrictive at about 1" diamiter -



Cat back in place -



Lined up and welded -



Fully welded and ready to go back on -



Back on the car -




My first major observation when driving home was how much smoother the car felt thoughout the rev range. I would never go back to a decat.