I've put 200k on my 2012 3.2l Bt 50. It's been a good run. Couple of little electrical niggles. BCM decided it didn't like the trailer wiring loom a couple of times - lost all brake lights. Supercheap Auto charge $25 to put a scan tool on it and clear the error code. Mazda dealers in Chch charged over $100 and wouldn't/couldn't tell me what the problem was. Independent auto sparky sorted me out with that bit of advice.
Rubber intercooler pipe split twice. Replaced it both sides with an aftermarket hard pipe kit that was cheaper than one OEM replacement rubber pipe. Had Diesel Tune NZ do a remap for me over 100k ago. Excellent performance upgrade for the $1200 it cost. Then I fitted an electronic throttle controller and that was the best $300 spent. What you think is turbo lag is engineered slow throttle response to help fuel efficiency. With the next ute I'd do the throttle controller first and possibly not worry about the ecu remap.
Also suspension, bar work, snorkel etc etc... none of which helped how much fuel it drinks.
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