Just to close this thread off, new OEM charge pipe fitted, $1080 fitted (Aus$727 for BMW charge pipe). Car drives like new now, I think the charge pipe has been leaking for months.
If you're noticing "perceived" power loss, and your N55 engine is 40,000k or more, definitely worth considering.
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BMW 2012 M135i manual
- Racechip Ultimate
- Hayman Reese Towbar
- Rhino rack roof rack
- Rhino rack Kayak mounts and T-loader
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