Blew a second motor in my 09 D8, after weighing all options, I went this route. It is the first cf4 and I am running the power commander, so there is a bit of a learning curve to be had. Jan 1 was my third ride, and the tuning is coming along. The snow is way fluffy,temps are way cold so tuning has been a bit of a challenge even for my auto tune. The bottom is crisp and responsive, but every time I try and get a wot run, my intakes plug slightly so I don't get a reliable trim. Also believe I have a bit too much weight in primary. Droped to 10/62 for Sat's ride. Overall It feels like it will rip when dialed. @ 7950 the motor justs purrrrrs. Brad is one heck of a guy and does what it takes to make thing right. I am way impressed with my experience with him.