Removing the main cat benefits / problems

[TJC46]

Hi guys is there any benefits to removing the main cat. I would like to modify another y piece and keep my own for mot time. just swap them over.I am trying to achieve a few more pops and bangs on the overrun, would being cat free help this. My old S3 which was precat popped and banged for fun! If i did fit a cat free y piece should it be baffled in any way to help back pressure. is there any other mods i would have to do to run cat free.

[blitzracing]

You dont need to modify the ECU or sensors to run cat free, its quite happy to run this way. You can however get better engine response by running a non catalyst fuel map if your car is inclined to shunt. Problem is however you need to get hold of a non cat fuel map chip from TVR power or the like to go with it. If the car does not shunt, then leave it running on the catalyst fuel map.