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They would die even if the car was left alone, just assume you'll need some turbos in the future and enjoy your car however you want.
Anything over stock is going to 'kill them prematurely' because you're working them twice as hard as they would stock, or more. Just the nature of it. The mild bump in 'stages' is barely going to be discernible to the turbos, as stock to tuned is the largest jump in output.
May as well enjoy it while they are working fine. I run my oem 158k mile turbos hard at 21psi peak with an ethanol blend and enjoy my car every day, i just try to ignore the wastegate rattle.
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2009 335i xDrive AT / 177k+ miles
PSP 750ic / Fuel-It! Stage 1 / BMS CP / Sutphin Tuning / RFP E50
11.61 @ 117.5
New setup; Covid 19Ts on RFP 93 + ARM inlets, dp, VTT cp and PSP outlets
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