Anything that frees up rotating mass can't be bad for racing. The performance gain is small as far as what you will tuly notice. But decreasing rotating mass in theory will give you a faster snap take stress off the engine and lower temps and increase fuel mileage. How much you will notice will not be much it will give you satisfaction that's the biggest thing I noticed when I swithed them. The bottom one is that t can't hurt any so why not.