You will notice a slight decline on the charge\discharge guage. But even at idle in stop and go traffic, it's still well into the normal range.
I ran motorsport pullies for over a year bafore I put on my blower and never had any problems at all.
Expect somewhere around 5-7 hp gain at the rear wheels.
Hope this helps,
Hammer
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"The Yellowjacket"
381.8 rwhp 377.6 rwtq
"Never underestimate the power of stupid people in large groups."