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you will not be dissapointed with an afterburner vortex back box and an afterburner mid section. You will find many people on here with the vortex and all agree its a great sounding peice of kit which will not annoy your neighbours but is loud enough to please your ears. Both are available from scoobyworld. The ASBO nur-spec will annoy your neighbour espically if you leave for work early.
Phone Keith at Revolution. He does cracking prices for scoobynetters on Blitz pipes without the need for a GB in most cases. I had mine from Revolution but it was ordered and dispatched direct from blitz-uk.
How can a catback exhaust give any performance gain?
Surely this can only be achieved as part of a decat-sportscat setup
There is more than one restricive cat in the exhaust system of the Impreza.
Although the De-cat downpipe/Sports Cat releases the majority of the power a full free flowing exhaust is required for maximum gains. The deletion of the other 2 cat's from the rest of the system will allow the system to breath more and therefore increase performance.
Believe it or not i had a 53 plate wrx and i had a scoobyclinic cat-back exhaust on it then ran it on there rolling road and it came out at 253 bhp,
with no other mods.