Hey folks, in regards the d-box, get it for this kit. The MAP sensor is way too close to the intake runner which causes pressure spikes that throw off fueling and cause misfires/rich mixture. We solved this problem on the sprintex kits with using a factory MAP sensor, but on the edelbrock you can't do that as the flange is different. The d-box will smooth out the signal and reduce the rich spikes which adds a good 15-20 hp and smooths things out. While we though of making a similar product, for what Bill charges for it I can't justify it, so just go for it and grab it. We've dyno'd it and showed those same gains they advertise
