hi guys,


hope someone can help.


i know that the Blitz nur spec r is a 3" system with a 2.5" flange on to suit standard system.

was looking for a down pipe (100 cell or decat) and a decat pipe to suit.

was looking to try and end up with a full 3" system, which could have the decat put back in for mot.

could i get a 3" pipe work downpipe and decat that goes to the 2.5" flange on the nur spec. would it effect performance going from 3-2.5-3" etc...

any thoughts on the best way to go about it.

the vehicle is a 2006 wrx 2.5 uk.

many thanks