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speed density or mass air

I have an 87 gt I just bought a vortech supercharger. My car is speed density i do not want to convert it to mass air. Vortech said it will run fine if i purchase a check valve assembily it is only 30.00 bucks. Other shops that I have talked to said the car would run like **** without mass air any one have a car with a superchager and speed density. this is what is done to the car trick flow upper and lower trick flow twisted wedge heads e303 cam 24lb injectors 190lph fuel pump mallory adj. fuel pressure regulator ger 3000 stall 4.10 gear. bbk ceramic coated headers bassani x pipe mac cat backs. other b.s all saleen suspension ssbc brake kit any feedback would be great....... thanks
 
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