Mine is a Mangoletsi manifold.A tuner company back in the day (Viktor Gunther-still exists) that made intake manifolds for the M30 that cleared the thermostat housing and angled up to clear the booster. Quite rare. I have a one piece one, they also made 3 piece ones that look like yours, if you post a close up pic of yours from the top I might be able to tell for sure.