Active Autowerke Coolant Pipe Fitting (CPF) (E36 M3 3.0 to 3.2)Upgrading your 1995 M3 3. 0 to a 1996 on M3 3. 2 engine is a popular performance option, but can be a complex task. Lot of little things can be overlooked like the heater hose that runs under the intake manifold to the engine front cover. The M3 engine front cover uses a flange with rings to receive the heater hose. The on engine doesn't have a corresponding flange, instead expecting a heater pipe to be present connecting up to the front cover with an