My Banshee is Pretty much Stock, The air filter has been changed to a K&N. I was wondering if i need to rejet cause of the extra airflow? or not until i mod the airbox or remove it? Thanks for any advice.

 

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The best way to tell is do a plug check. If you are going to be running lean it won't be much. Just running a K&N with the airbox lid on probably won't make a huge difference but I don't think you'll need to rejet just for that...but don't quote me on it. Actually you might since they come lean from the factory. Lets hear from some people who've actually done this though...