What size do I go up?

[Jakerz]

I am changing from a stock air filter to a uni air filter will I have to rejet? Its a 03 by the way

 

[Wheels]

Try and keep this in the same thread so the people that chimed in earlier can give you their input. Blaaster thinks it could change a jet or two, I switched to a UNI and it didn't change. You can't take our word for it though you need to go do a plug chop to see how hour bike runs and your plug looks, then go from there. It may seem like a hassle but plugs and jets are cheap and your bike will run way better for way longer once you get it right. Tell us more about your new quad and post some pics.