The can has a 4" oiled pre-filter. This filters the CVT and pre-filters the engine intake I still have a Uni on the engine. This might be over kill but I don't thank so. I lost a engine because of a blown stock filter come hell or high that's not happening again.

Thanks. I don't think there is any thing as overkill on the intake. The more filtering the better.

[2015 Z Force 800 53/Trail EPS]

Long as it doesn't become restrictive IMO there is no such thing as overkill with these...or any machine expected to operate in these conditions. Just can't be too carefull - after all, particle ingestion is the #1 killer of these machines. #2 is heat.

I still have a uni filter in the box. The canister filter filters the CVT air and pre-filters the the intake air. Of course the particle separator eliminates 94% or more of all the crap in the air.