don't get us wrong "jig".. cranks work and the performance gain is VERY noticable. they also arent a "problem" upgrade. just like anything else, there is always a possibility of failure. alot of guys have nothing but good luck with stuffed strockers. there is also the non-stuffed strocker. they are flawless like a standard crank. with a stuffed crank they remove some material to balance it out. the stuffing is added to reduce crank case volume on the down stroke to get a better blast on its return up. one of the bonuses to adding a stuffed crank verse a non stuffed stroker is you don't lose any rpm. with a non-stuffed stroker you will lose a noticable amount of rpm's but gain a great amount of torque. the stuffed stroker balances it out.
jersey- you will be happy with any upgrade to the motor. but if your not running a pipe, then alot of the high end modds like porting and cranks will have little affect. if your not running a "good" pipe, i can promise you that you will get more out of a $150 pipe then you will out of a $180 motor upgrade. if you wana stick to the $100 budget then grab a ported or non-ported gp29(28.5) and let it rip with whatever can exhoust you are running. you wont be disopointed either way. ported mills are not all that much more cash then a standard non-ported. im running a non-ported gp29 and an X-can in my mt and it rips. ($155), hope this info helps..