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Performance.
I can't answer that because I pulled the engine with 8KLM and changed most of the internals. The end result is a much improved ride.
Rejet.
New carb to suite engine upgrade.
Exhaust pipe material.
Nothing special to weld,it looks like a mild steel tubing. I welded mine with a TIG.
The only reason I cut the exhaust was for reliability out on the road as the bike is used for touring. I've seen to many of these systems fail due to cracking at the Y piece.
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