Yeah its interchangable with the 328's. I heard the two engines are very similar, the 328 just bored out more obviously. I'd even go so far as to say you could put m3 camshafts in your 323, and put a higher final drive gear (differential). But yeah.. if you want an intake, exhaust, clear corners, headlights, shocks, springs, etc.. order it for the 328, and i promise yah it'll fit.
