Technically speaking, you would need the install kit, since the Roush intake is only a drop-in for the factory air box and paper filter. However, Ford has discontinued production of the install kit which makes things interesting for folks in your position. That being said, you can still install the Boss 302 manifold without the install kit, but you would need to modify and extend some of your lines in order to get everything to work while stretching your inlet tubing up to the throttle body's new position. If you want to get more specific, give us a call directly at 1-877-578-2433.