Hi mate, i did the same thing as you, although i wouldn't say mine is quiet its only quiet when your sat still or not flooring it!! i actually prefer that efferct rather than a chavy saxo vvvrrrrroooooo all the time, also Jabba told me if you have the dp on a standard 130 turbo it puts alot of stress on the turbo and will shorten the life!! i am having my big turbo and downpipe its going in on saturday should get it back sometime in the next week i will post some soundclips when i get it back!!