Hmmm see now everyone says that, but ive been thinking recently. I had far more fun doing up my 50cc than bigger bikes. 50's are cheap to do up, esp the tzr because they've got the mineralli am6 engine in them it means u can squeese loads of extra power out by not even changing to much. I would say if u were to change exhaust also change the jets in the carb only go up a couple though (think i found them for a coulpe of quid each so i brought a load of diffrent one likes). And then put a K and N style or similar air filter on. Also on 50's whack pro boost in there because for some reason that adds loads of feelable power to standard and modded 50's. At the end of the day its your choise on what u spend your money on, it would be wasting it spending on a 50, but it is one hell of alot more fun spending on a 50 imo anyway
and yea it will always sound like a tinny 50, but when i had my leo vince exhaust and k and n style filter to me it sounded loooooads better (i dont think it actually did to anyone else around but thats not the point )