as above , has any one fitted one of these? I have a ppp back box only and want a bit more power/torque. I was advised it was the best cat to remove ? Anyone done this yet and what was your opinion ? Is it a safe mod ?

 

As far as I know "it's safe" modification but you have to buy a CEL FIX device to use in your rear O2 sensor otherwise you'll have PO420 fault code.
Best to complete decat your car as even with one (rear) cat you can't pass MOT tests in most cases.
You'll gain about 25-30Bhp with full decat but most important huge increase in throttle response and low down torque. I am going to buy very soon my own full system. Of course warranty is off with the above except you have a friendly local dealer.
JIM