What size of the injen hydroshield will fit the K&N drop in filter???

 

none of them..... they only fit cone filters...

 

I don't think any of them will. But if you happen to find out let me know.

Oh and K&N is terrible for the motor IMO. Stick with the stock filter and open the airbox a bit. Look at stock Corvettes and other high-dollar sports car....they come with paper filters stock and the performance is just fine. If anything I would recommend AEM Dryflow.