MAP bypass valve?

[sfcadams]

Anyone have any info on how exactly a MAP bypass valve is installed? I am asking because I have a speed-density 87 Mustang 5.0 and am being told that I need to run a MAP bypass valve to keep boost from being seen when I install my Paxton 1220SL....

Is anyone running one of these bypass valves on a speed-density Mustang and can comment on it?

 

[strtrcr50]

Anyone have any info on how exactly a MAP bypass valve is installed? I am asking because I have a speed-density 87 Mustang 5.0 and am being told that I need to run a MAP bypass valve to keep boost from being seen when I install my Paxton 1220SL....

Is anyone running one of these bypass valves on a speed-density Mustang and can comment on it?

This would be what you need. It goes inline on the vac line to the MAP sensor bolted to the firewall.
Check Valve Assembly For Speed Density Vehicle | Vortech Superchargers
The factory MAP does not like to see boost. FWIW, you would be better off to convert over to mass air.