WR1 Owners Club

Ive had the turbo back decat and remap. Was wondering is it worth decating the up pipe section aswell.
Also is it a matter of a straight swap or bigger pipe ? I guess the up pipe is standard 2.5 Inch ?

only the new-age 2.0 WRX cars had a "pre-cat" in the up-pipe......................

you can get some gains from fitting a Harvey Smith "trick" up-pipe and then if more serious porting the headers (would be best mapped to suit)