Let's talk BBK
 

Ok, I know BBK has put a decent amout of time into their LS line of products. I'm just wondering who is running their UD pulley? Does anyone have a back to back dyno with results. I know they advertise 9-12rwhp increase which is a damn good increase at the crank for just a pulley. But I also heard their kit os only like a 10% where as Powerbond is a 25%, so would that mean you should expect 12-20rwhp from greater % of UD?? Or are the numbers padded a little for sales? I'd also like to hear what people gained real world from a Powerbond if your running one & have numbers.

Basically I'm wanting to decide if its worth the cash or not to even mess with it & thats stubborn crank bolt or not, LOL.

on a 25% underdrive you can exspect a 8-12hp gain less then that on a 10%