Engine: B58/N55/S55 Charge Pipe Fitting
Charge pipes are a common discussion on turbo BMW engines. The charge pipe (CP) is partly responsible for carrying charge air (or boosted air) to the engine. Unfortunately, BMW's engines use a plastic charge pipe. The N55 charge pipe in particular is prone to cracking and popping off at higher than stock boost levels. It's not even an uncommon failure at stock boost. This is where upgraded charge pipes come into play.