Mass Air Kits
Sorry to hijack your thread guys - thought I would share some experience with the Ford Motorsport Mass Air kit - s/b same as Downs Ford kit. I have had recurring problems with the conversion wiring loom at the connector to vehicle harness. Which was bad enough for FMS to offer to refund my money - expect I would have to pay double to get a different version. I just fix the harness every so ofen. Driveability was horrible till custom chip developed with road testing with tuner. I am running a supercharger @ 10#, Edelbrock RPM heads, Trick Flow R intake, 75mm TB, 30 lb inj & FMU, 216/222 & .512/.522 cam, 1 5/8 shortys, bassni x-pipe and custom exhaust. I had the mass air meter re-calbrated by Pro-M (they were still in business back then). There is not much out there that's inexpense now! If the quality of the wiring harness has improved on the FMS/Downs kit then it with a custom chip would work well. I started down the path with using a 9AL for engine management - but lost interest. I never picked up much gas mileage by going to mass air - 13/14 in town, 16 hwy, but truck runs mid twelves @ 109/110 mph on street tires and lowered suspension so who's complaining.
Just thought I would share my thoughts - in this case if you could pick a used kit it may be worth it.