hey guys new to the forum but long time follower. I just sold my 06 f-350 cc/sb and looking to buy a new truck. My question is how much faster and what the weight diff. is between a reg. cab, a supercab and a crew cab. really like a crew cab but like going fast to. Probably want to stay with a 6.4 but also might consider a 6.7 depeding on how much faster there going to be. Going to buy one pretty soon so thanks for ay input.