HI all, not sure if this has already been discussed but I remember a top gear episode where they modified their cars and it made no difference. Now obviously doing a stage 1 and so forth does make a difference but in the show they upgraded other things I recall such as induction kits and I think exhausts as well. So in terms of items such as these, exhausts/induction kits, do they make a marked improvement to horsepower? Or do people just get them for the car to sound better or to look nicer? Thanks for any views on this