So im looking at the billet reed crank cases that turtle racing offers and they look pretty impressive but I don't have any experience with them so I have a few questions. it looks like the intake is in the crank case? Does this mean the top end needs to be blocked off? Do they offer great performance for their price? I plan on doing lots of porting training and experimentation and I would need to replace the top end fairly often to see and compare numbers, im wondering about the durability of it as well. Do they make a 45cc version? Can I use enclosed bearings or do I have to stick with theirs? Lastly ive been hearing lots of issues concerning TR quality issues lately. Should I be concerned?