i agree with that...that 10hp difference is too lil to have all the fuss...i applaud Jon as well as MS for continuing to develop their products for a car that hasn't been on sale in the US for the past 11 years! so it goes to show their determination and efforts...i applaud them both and when im ready to purchase i'll take into account more than just a flowbench test.
i do like how Jon's manifolds are design for a straighter dp design...so i do like that idea...is there more info on your revision 4 design?