My 2008 roketa 250cc

[PhillyRich]

It's the LinhaI clone I've changed oil,and flushed radiator the is not really nos wat u do is you tap a whole in your intake and you screw the fiting in then hook hose to the bottle but don’t really see any improvement in horsepower I thought it was missing something on the exhaust will a leak or missing gasket stop it from hitting top speed I also been looking for a aftermarket exhauast that's not to expensive

Thanks for any input
PhillyRich