I have a twin dump decat downpipe fitted and im thinking of changing it to a 3" widemouth downpipe.

My query is that i have a blitz nur spec RX system and its 3" but with 2.5" fitting for connecting to the downpipe. Do i

A, buy a 3" downpipe with a 2.5" fitting which means i have about 3" or so of the center section which is 2.5" with the rest being 3" so would it affect any performance.

B, Buy a full 3" downpipe and get a 3" to 2.5" converter for it so that only an inch would be 2.5".

Cheers

Drew