A lot! This all depends on the type and size of the supercharger. At boost levels of 7psi you can expect around a 40-45% increase in HP. At 15psi you can expect around 100% increase in HP. HP really depends on boost levels and existing engine HP.
To increase an engines Hp/Tq, by increasing it's volumetric efficiency ( how much air/fuel is in the cylinder).
No minor thing you can do will really increase H.P. to any significant degree. Installing a supercharger would give you a significant increase.
5,835,073,688,495,768,869
Go with a supercharger or a turbocharger.
Go with the supercharger if you can.
turbo gives more hp then a supercharger
about 135 hp i have an 07 gt that has a roush stage 3 supercharger on it and i have about 410 to the wheels so about 455-460 hp.
GM already implemented all the CHEAP ways to increase HP. You'll need to spend some money on high performance heads, racing cam, supercharger...
Yes
With a supercharger or turbo+ chip+exhaust
There is no one motorcycle, and no one answer. It could be 5 hp or 100 hp. The 2018 Harley Road Glide has 77.34 hp