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93 Posts
Had a Collins dumpvalve for 7 months and all is great and i personally like it
, (im fully aware other people dont!) but recently because of the cold weather ive put my car back to stock and now it's not as loud,
i know the obvious reason would be not as much boost is being released but even at 0.6 bar its not what it used to be, ive checked all hoses and all are ok with the jubilee clips nice and tight, any suggestions??

