Ive put Brake lines onto most of my bikes in the past, its best to use NEW crush washers, and banjos, but if the banjo bolts are in good condition then just the crash washers, bleed the left side first then right, (as you sit on the bike) it can be done but a friend to help will bleed them alot faster, once done go back and forth 2 or 3 times to each side to make sure its free from air, At first youll think nothing is happening but itll work just keep bleeding. once you think your done check all bolts and bleed nipples the brake lever should feel hard and not squishy, if it still feels soft try a back bleed, take a caliper off the bike, losen the banjo at the top next to the master cylnder, and push a piston in youll see some air come out and that should be you all done, Always ride slow at first when youve done your brakes test them in a clear area and never do back and front at the same time! as for cans i cant say if you will do harm to the engine or if it helps the performance im not an expert, but i think the tyga ali cans are cheaper? if its just for looks