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You may loose some of the rasp but I'm not sure. Also, not sure what kind of guarantee/warranty YozzaSport offer on their systems but if you have a silencer welded in to it I'm sure it'll void the guarantee/warranty.
you could always get a silencer put in so it is removable and can be replaced with a strait through pipe for when you feel like a bit of noise. i was thinking of this for normal day to day driving but putting the pipe back in for things like drag strips and track days (when i eventually get round to doing one)