odd...I talked to Ed the other day and I told him I am running the AE 2035 and he said he did some testing with really good results on the 2035...I too am running P3 plugs and my engines run great and am getting over 12 mins to a tank on them...I also read that these engines are not "pipe" sensitive. I will try a P4 and see what happends..
Thanks,
Ryan