'Speed Density' refers to the fact that the computer is looking at the speed and density of the air entering the intake, whereas 'Mass Air' measures the actual mass per time of air coming into the engine.
Speed density cars tend to run a little stronger stock than mass air, but will encounter idle and driveability problems if more aggressive mods are added (heads, cam, etc). Mass air systems are better at compensating for mods.
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Strike down the unroadworthy!
2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more
'94 Rio Red Cobra: All the bolt-ons, 3.73s
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