this is a question for a LT1, for my friends car, but hopefully you guys can still help me out. she got a hypertech underdrive pulley for her 94 Z28. she got the one pulley and thats it. will she have to buy a different belt for her car now. im pretty sure she does, but wanted to check. also, she has a huge system in her car. will she have charging issues even tho she has the red-top optima batterty. should i tell her to get the overdrive alternator pulley too, or do you think she will be ok. thanks in advance for any help.