The S/S Kook's are awesome and the P.I. 2400 converter works well too (will find out how it race's this weekend i hope). I also have the Plasma Booster and Denso IT-22's in. I did some mileage checks while traveling down to TN recently. Without the mod's above but other's including #6 pulley, elect fan/pump, and the other basic stuff i got 15.54 after filling up at 278.7 mileage. Now, returning with the heavy mod's it was surprising to me. I got 16.50 after 319.6 miles and then 17.55 after 263.5. The 17.55 included going over the mountain area of Rt 33 and going through the traffic of Charlottesville!!!!!!! The more i mod the better the mileage....ya just gotta love it.