I just got my EXP 2.0 today (the"$ 400.00 one"). It was very easy to install and customer sevice at Rekluse is top notch. It took my 450 beast and turned it into a lamb for the trails here in northwest Pennsylvania. I can accually ride it like a trail bike or open her up and she becomes the race machine that she is. If you are older like myself and want to have the best of both worlds look no farther. No need to regear, no need to add fly wheel weights, and it never stalls. Oh and another thing my 450 friends NO MORE CHAIN SLAPPING!