been told it improves performance but not sure how much you will gain. a mate has one but his fueling needs sorting before he boots it to tell me what its like, but a shorter pipe run means exhaust gasses can exit quicker= better performance apparently!!! if im honest i dont think its louder than my mongoose with a silenced de-cat pipe! you will probably think its louder as it will be nearer to the driver. personally i would spend my money on something else