that's an opinion , but i'd have to say pro circuit
metal - duhhh.....
A slip on exhaust will give a dirt bike more power. A full exhaust setup will give you even more power than a slip on.
It could be condensation from hot exhaust gases on the cool exhaust pipe.
yes
Put a potatoe in the exhaust pipe
Opens and closes the intake and exhaust valves.
no
Kawasaki is the best 125cc dirt bike. Hopefully this link will helps you.
Yamaha TTR125 is the best dirt bike. I think it’s a good idea for a beginner to use a dirt bike with low engine power. Yamaha TTR is a perfect mid-size beginner bike; it has a 124 CC engine with four strokes.
plug up your muffler next time
yes you can but don't put it near the exhaust pipe.
if you want a bike for trails and dirt go for an eastern trail digger or a fit bike