I install a fuel restrictor and my fuel pressure at idle read 45. I began to turn it down (close the valve) and it never really dropped at WOT. I got half way closed and it only dropped to 44. I was doing this with the rear end raised in the air and only had it WOT for about 2-3 seconds. I stopped becuase I think that the best way to do this would be with longer runs and a load on the sled and then I could get a better read on the plugs, does anyone agree? Also this sled just seams to be running rich, even with the 06 mapping. Has anyone had any luck with turning down the oil pump? Where is it located on this sled and is it an easy adjustment? I do seam to go through a lot of oil. i should mention that I also have a DD Y-pipe and Bikeman stealth pipe. Thanks.