This Corsa SRI performance exhaust is 2.5" (63.5mm) pipework and removes the pre-cat, this exhaust fits directly between the turbo and the main catalyst.
As long as the car is still fitted with a catalytic converter, this exhaust will still enable you to pass a UK MOT emissions test and police road side checks.
All relevant fittings and gaskets are supplied (Except turbo clamp).