prodrive exhaust system

gerry

Octane Boostaholics
I've been told I have a full prodrive exhaust system on the car even though it says sti on the backbox ( I know Nothing about mechanics or the like anyway). these things cost big bucks I'm told too .. what bhp gains would you expect with it. also the cat has been takin out .. can this be put back in or do I need to put back in the old exhaust when I get it as it won't pass an nct without it
 
think it might be standard one so cause I was talkin to original owner of the car an he said he paid a fortune for an wxhaust . The car was sold as having one owner but since found out someone else had it since Feburary so it could have been swapped
 
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