[M3/4 life]

I’ve been thinking about purchasing the Dinan Underdrive Pulley Kit for it claims an additional +11 horsepower @ 8400 rpm and +7 lb-ft torque @ 8400 rpm.

For all who have the Dinan Underdrive Pulley Kit how do you like it? For all that are running another brand of Underdrive Pulley kit what are your thoughts on it compared to the Dinan? Do you feel it makes a difference?

Thanks in advance,