Just finished the exhaust, I used the 2-1 section from BMW F800S plus the rear section, a bit of old Ducati 749 pipe for the link pipe and the rest i fabricated from 38mm stainless Mandrel bends. I got 105 deg for the top bends and 55 deg for the bottom bends. I had to cut close to the bend for the top to get the downpipes close to the engine. In doing this i found the pipe wouldn't slip over the exhaust stubs. The diameter of the tube is reduced in the bend and a couple of inches either side. I had to weld a short section of straight pipe at the manifold end, bit fiddly getting correct angle. All fits ok, have strengthened can hanger now and will make a support underneath next.
I managed to weld using a stick welder, i now have a small inverter that goes down to about 20 amps. Made these welds at 30-35 amps using 1.6mm stainless rods.
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