ok ive got about 100$ to make my car better. i have a 90 cougar xr7 im thinking of getting the overdrive pulley for the blower . however my car has 94000 mi on the origional head gaskets. is this a bad idea the exahaust is modded by i have removed the mufflers completely. i plan on removing the cats too. should i remove the cats before the pulley or should i not worry about it??