Found 2ft of spare 40mm hose from a water feature in the garden. Cut one end at a slight angle and cable tied to the inside or the front grill and the other end cable tied to one side of the induction inlet. No tools required. Works a treat. Try it. If it doesnt work, at least you will have a nice little water feature on the front of your car.

 

As long as you don't get a 'water feature' inside your engine I'm sure you'll get about 1 extra horse.

 

I wouldnt drive it through a river but for normal usage & track days its fine. The quicker you drive the quicker it goes, giving you a Cold Ram Air effect.