Since we're talking about UDP's, I'd like to ask a question, too.
I've had a lot of free time while on winter break, and I was just thinking about that UDP I have. When I had it put on, the stock belt would slip REALLY bad during the 1-2 shift, so I put on a shorter belt. But I was just wondering if that smaller belt would screw up some of the effect of the UDP.
Because the whole point of the UDP is to increase the number of rotations for the crank to spin the serpentine belt(like a gear reduction), but now that I've shortened the belt it now takes fewer rotations for the crank pulley to spin the belt, increasing resistance and accessory drive. Does this make sense? If I'm right about this, why would companies advertise a shorter belt with their UDP's?