Hi to all,
the lower manifold of the 2.8l and 2.9l are all the same. No difference.
The upper manifold of the 2.8l and the 2.9l have the same intake diameter and the same outtake diameters. The only difference is the internally area, the 2.9l is larger there.
The throttle body of the 2.8l have the same diameter at the intake side, at the outtake side and they have the same diameter at the plate. There are only the ramps in the 2.8l. But notice ===> the 2.9l throttle body simulates the ramps by their mechanic between the plate and the pedal!!!
The XXL TB´s I offer are more effective as the 2.9l ones.
Only the OBD2 throttle bodies have less diameter at the intake and the outtake side.
Hope this helps. If oyu need VR6 parts like XXL tb´s, manifold parts, NO problem :-)
Regards from Germany,
Micha