What are some modifications that I can do to a 98 GTP that are relatively cheap and work? People told me about the chip but I heard that is a waste of money. I already have a ZZP PCM and cold air induction. I have a 3.4 pulley but I am wondering if I should order the whole set or stick with the 3.4 but then a few shops I went to around Taylor, Michigan didn't have any kind of pulley tool so they wanted to charge me $75.00 to do so.