Nice, you’re trying to squeeze every last drop of speed out of that old chopper. Drop the weight first—swap the stock pipes for lightweight titanium or even stainless steel tubing, keep the bends to a minimum. Get a high‑flow muffler or even a straight‑through system with a proper catalytic converter if you’re still into that. Open up the port size a bit, tweak the carburetor or fuel injection for a richer mix, and don’t forget to lower the idle and rev slightly higher. If you’re into the extreme, a short‑sleeve cam or a bit of supercharging can make it truly straight‑line. Just don’t forget to tune the air filter and keep that throttle smooth—you don’t want a throttle shock that kills the throttle. Go wild, but keep the engine in mind, or you’ll end up with a hot potato that stalls.

Good call—titanium headers, less bend, high‑flow muffler, all that. Just remember the cam: short sleeve means more power at the top, so if you keep the revs in check with a good cam lift profile and maybe a little timing advance tweak, you’ll avoid turning that bike into a runaway. Keep an eye on the oil pressure and cooling; a leaner mix can heat things up. Once it’s humming, let me know if it’s a straight‑line beast or still a chopper in disguise. Happy tuning!