What is this black spring people are talking about??Im assuming its a clutch spring--What does it do & how much $$[img]i/expressions/face-icon-small-confused.gif[/img]

 

Banach,
I recently tested the EPI black secondary spring. Check out my results here

My testing indicated no loss or gain in acceleration and top-speed...but you do get the added benefit of longer belt life. The spring generally costs about $25 bucks.