Russ im sure that you can use the PH2 lower which can be the RS stamped one.
The upper i think has to be PH1 on a PH1.
Hello,
Will a Phase 1 plenum mate up to the Phase 2 lower inlet, or do I need to buy the complete Phase1 plenum and lower inlet?
Regards Russ.......
The ph1 plenum won't fit the ph2 unless you block the idle control valve hole by the throttle body mounting surface, otherwise the plenum i think is the same.