Just to add to the BMW confusion ... James is arguing that a Z3 is an E36, because internally, BMW calls it an E36 (specifically, an E36/7 for the convertible). It *is* an E36 forward of the firewall, with different bodywork. It does have an E30 suspension bolted into the back.

To make matters worse, '99+ Z3s were part E36 (main chassis), part E30 (rear suspension), and part E46 (engine & electronics). The chassis is a variant of the E36 chassis by BMW's own nomenclature. I think his question is valid.

In layman's terms, he wants to use a Z3 chassis with an E36 325i intake manifold (not available in any Z3) with an E36 328i engine (which was also available in the Z3). This engine/intake combo would clearly be allowed in an E36 sedan or coupe unibody, but is unclear if it's allowed in a Z3 unibody.