the one i got is fairly quiet on idle n mental when u accellerate hard. japspeed 3" downpipe with high flow sports cat with a 3" from downpipe to tail pipe with a 4.5" exit on the rear silencer.
Only drawback is the split-style speedbumps are a no-go when i have 3 passengers in the car.
£500
Downpipe:-
http://www.japspeed.co.uk/Subaru-Imp...T/p-23-72-403/
Back:-
http://www.japspeed.co.uk/Subaru-Imp...e/p-23-72-394/