It's opened up to much by the boost bypass hole. The PCV passage that runs around the boost bypass hole (gen 5) won't seal. This manifold will work with a Intercooler but may not seal right without it.
So it will work with one, but will it work without one too?
1998 GTP Sedan: Gen III, Speedy Daddy Headers, SLP Catback, Magnaflow High Flow Cat, Open Cone Intake, Autolite 104s, Debadged, more to come!