I'm looking on redoing the exhaust and breaks on my 85GS with 81GSL rear end. I am planning on doing a RB Header and Muffler, but is it possible to do those with a Cat and custom pipe between? Also I'm looking to get new rotors, pads, calipers and stainless break line kits. I'm planning on doing hawk pads, but as far as the rest I have no clue. All the break line kits I find say for 84-85 w/rear disks, but I have an early year rear end What kit will work for me front and rear? What company makes good rotors for my front and rear? Same with calipers?

Thanks Jonathon