Well, you would certainly not go wrong with either choice, but I would go with the NW Dual first. My reasoning is 2-fold. First, the stock Y-pipe going into the throttle body is so restrictive. It seriously robs your SRT of existing HP. The CAI will allow the car to breathe the way it should have from the beginning. Second, the CAI will allow you to hear the sweet sound of the SC..... putting a smile on your face every time you get on it.

Both will give you significant HP gains, but for me, the CAI gave me the best butt dyno results, and the most grin for the buck.

I hope this helps.