They should be copper nuts, they were on mine anyway. I put my brand new original header on the black bike, along with new Scorpion stainless can. Then put the old original off the black X Country onto the X Challenge to replace the Remus system. Managed to get the both done in the day - the Touratech tank prevented removal and I had to take all that lot off as well, which simply added to the time it took. Both bikes back up and running and oh how the Long Ranger sounds so much better with actual silencing in place! I don't know why, but it cruises at a much faster pace for the same kind of engine sound than the X Country - both wearing 49t and 16t sprockets, both on 19" and 17" wheels (X Country wheels). Why that is I have no idea.