I finally had my AFX pulley installed last Friday, and the first thing I noticed from the lightened crank pulley is the the extra "pull". Also, it feels like I recieved some low-end power as well. I usually start to lose power at about 65-75 mph, but she feels a little more gutsy to me...... I haven't had any problems with overheating or my A/C (thank god). My temperature gauge stayed at its normal half-way mark and never rose(I payed close attention to it, trust me). It has been 100-105 degrees this past weekend where I live and the A/C is still cold, just the way I like it. I know alot of people are worried about getting UDP's for those reasons and a few more. I remember hearing that you can lose some steering due to the power steering pump being underdriven. My steering feels the same as the day I took her in to have the pulley installed. My engine sounds a bit louder while in high RPM's too. I think I would feel more performance if I was MTX instead of ATX, but thats how it is with most mods anyway. All in all it is a good mod for the price. I did pay to get it installed. I didnt have the right tools for the install (that and I heard it can be a real pain). From what my mechanic said, it wasnt that easy of an install, but it could've been worse. I recommend to anyone looking for gains with low money to get this mod. Hope this helps anyone out who is questioning purchasing a UDP kit.