For the Honda Phantom TA150 performance upgrades you can also search for Honda NSR150 parts. The Honda TA150 and NSR150 share the same engine, the final drive (sprockets) are different for give the Phantom TA150 more torque and less top speed.
For the exhaust system you probably need some modifications, I’m sure the average metal workshop or blacksmith can do that for you…
Does anyone know of any upgrades for the TA 150. Exhaust, carb. ect.