changing tip will add nothing but looks.
as for hp, $200 will net you somewhere between 5-15 hp only. that's just for adding an aftermarket intake or a free flow filter(K&N, AFE etc). to make it "feel like" you have added hp, gut out the interior(seats, carpet, jack etc.). taking weight off on a car is free to some degree, but can be a safety hazard. acceleration will be more quicker.
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