My car is NA now, but I hope to add a twin screw in the future. Should I go with the smaller primaries now to avoid loss of low end power, or should I suffer now in order to have the larger diameter when I go FI? I am leaning towards the 1-5/8 but I wan to know if anyone else has been through this. I will be running on the stock internals with the supercharger so I would assume that I will be able to reach the limits of the motor regardless of which headers I use.