has anyone out there put a K&N air filter on a 400AT rancher? Wanting to know if i have to rejet to use this filter. everything else is stock.

 

With just a K&N and no pipe or any other mods you won't need to jet, but you won't notice any power increase with just a filter.......Even if you jet it with the filter you still probly won't notice any increase......I am looking to boost mine up aswell, but until the pipes come out for it we are just going to hang on until the do......I was thinking of going down a size on my jeting because it seems to be on the rich side from the factory.....If I could get the mixture right it would probly help it out some....