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E36General discussion and technical help for (E36) 1992-1999 3 series cars. 318, 323, 325, 328.
no, the m50 manifold was used on the 2.8L engines that are OBDII because the OBDII(post 96 cars) have a restricted manifold which cuts down performance in order to improve exhaust emissions or a bunch of other crap, who knows, but cars pre 96 didnt have that problem. with your car, a 320, im not even sure if the block is the same size, but even if it was then you would probably have the same manifold and it wouldnt make a difference
Originally Posted by c1apton
I keep forgetting that - I have a great memory but it doesn't last long
It won't make any difference, in fact you could make things worse. The M50 manifolds from the 320i (M50B20) and 325i (M50B25) are indeed different part numbers. There are slight differences; the intake air sensor and brake booster ports are in a different location on the manifold. You could get around that stuff, but the biggest difference is this: while the intake runners look identical, the ports on the cylinder head are slightly smaller on the B20 engine. I've read horror stories about this because the gaskets don't line up properly and you end up with serious vacuum leaks.