I didn’t even know they made performance parts for the RE.
https://phoenix.craigslist.org/evl/mcy/d/fountain-hills-royal-enfield-650/7626027093.html
The standard 650cc engine was bored to 865cc and fit with S&S Pistons & race cam, low restriction air filter, and Tech two into one Stinger exhaust were added and the bike was dyno tuned to the engine, intake and exhaust modifications.
https://phoenix.craigslist.org/evl/mcy/d/fountain-hills-royal-enfield-650/7626027093.html
The standard 650cc engine was bored to 865cc and fit with S&S Pistons & race cam, low restriction air filter, and Tech two into one Stinger exhaust were added and the bike was dyno tuned to the engine, intake and exhaust modifications.