[elf]

Fitted a Remus viper carbon fibre oval end can on my ZX6R J2 2001 model. Later I added a K&N Filter and dyno-jet kit. Boy what a difference, Power is a hell of a lot smoother and these's notable more off it. Well worth the cost and effort to fit.

BTW I tried both a Pipercross and a K&N filter, both gives a huge improvement on standard and there's little to choose between them performance wise.

 

[elf]

it can give more trouble cause the bigger air flow means the engine runs leaner. add to that a new can and the poor thing is gulping pure air with no fuel. You'll need to get a dyno jet kit and then have the engine dyno tested and set up on a proper rolling road.