Except for the pipe, spark plug air filter...

What other parts can you modify to upgrade your ride?

Modified/Racing bikes are not meant for everyday use right?

R150 is a fast bike... i am just curious why people replace their cams with racing cam, their block, carb and other parts? but the question is that - will these changes be good for your bike?

I know this is odd but i just want to know which part can be modified if you'll be using it for everyday use only? basically to make it go a bit faster...