I have anSN95 (130 AMP Alt) and I have the ASP underdrives. The only time I have problems with power, is when I have my stereo on (Mach 460), headlights on, and running lights on. Even then if I give a little gas and increase the RPM by a mere 200, I'm fine.
It may be a little trouble, but you're not going to get a better return on the $ when horse power is concerned!! I use ASP pulleys, so far very good quality.
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