My experience with BMW hasn't been good.
Supposedly 3 of 6 injectors replaced under warranty only.
You are lucky to have had your HPFP replaced under warranty, if they actually did so. I would think you would be blessed if you get anything out of them post warranty.
Go to your nearest reputable BMW tuner (Advan, Hills Euro etc.. in Sydney) (Southern BMW ...Melb) and determine what codes your car is throwing before planning a course of action.
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135i - RHD Bottom Mount Single Turbo - GTX3584RS
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