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I put the ASP underdrive pulley on my Z. No problems at all with it. The battery and voltage are right where they were before. Everything works as well as before.

The only downside is installation cost, unless you do it while doing other major work. My pulley-only install was $140.
 

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I have the MTI Pulley with no adverse affects.
Gave me 6 RWHP. My mechanic charged me $180.00, 3 hours at $60.00 an hour. But the dyno run was free.
 
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