Hi, I have plan to get one new STS engine for my buggy and dont know which one to choose. D21E or D21B....I know E is the 3 port and D is the 5port. I just for bashing and not go race. May I know 3port version is how many rpm? Any pro and con on both engine? I cant wait to get one.......Thanks.

46u, may I know what type of the brake-in you using? Can send me the procedure if you can..thanks.