yea the clamps BLOW. get some good band clamps. im still looking for some good ones for mine :/

and for the back header, pretty much i slid them up from the bottom while a buddy laid on the motor and tighten them down.

also when you go to tighten the down pipe down, make sure its not pulling down on your cat-back. mine was at first and my mufflers were hitting the underside of my car. just an FYI