Depends on the milage of the car, If you near or past 60K get the UR pulleys, since you will have to change the belt anyway. If you do get the pulleys and replace the belt, advance the timing as well, since your messing. I had the dealer install mine (no real time in my hands to do it) I noticed a big increase (thats going from stock). If your no where near the milage get the HS CAI...just my two cents. I also havent had any problems with the UR pulleys (2 piece set)
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