Just wondering which underdrive pulleys are the better choice, March or BBK? I want to retain the full cooling/charging characteristics. Are they even worth doing?? Thanks in advance for any feedback.

 

I've had the BBK's on my formula. I i didn't have any charging or cooling problems. my car would only hit 220 when sitting in rush hour traffic, and at night with the lights and stereo(stock) on the volts would be just under 13 at idle. I did feel a small boost in performance, it seemed to rev a tad faster. In the 1/4 my et didn't change and I gained 1mph.