I would make a homemade unit, but am leaning more towards the apexi unit to be on the safe side.

This is one of the last things I have to get for my SVT, so I'll have to look into the homemade.....er...."custom" setups

2005 Ford F150 SuperCab FX4 1964 Chevrolet Impala SS 1998 CSVT: 354HP/328TQ @ 10 psi, now gone