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can any one tell me how much good will a hks down pipe do i no there a must do on a subaru to remove the 1st cat but will it make a big diffrence on a r32 gtst :puke: :flame:
 

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Yeah do it, free's the turbo up, makes the most of a performance exhaust system. I don't know of any dyno proof between stock and aftermarket downpipe, but you'd get good gains with performance downpipe, elbow, de-cat and cat back, especially with increased boost, turbo will have greater longetivity and response.
 

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yep defo as I have put my nismo down pipe on my r33 today and it does feel much better in response.
 
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