I'm going to be getting the Athena 480 kit soon. Who has this on their R? How does it run? Did it make alot of difference? Can anyone tell me a few places that sell them that I can check out? I want to check prices and see what options there are for different compresion ratios? Do all the kits come with the same compression ratio, or do you have an option for what piston they send with the kit? Any info would help. Thanks in advance.