So if I want to really be somewhat overcautious and try to make my car last as long as possible, is this list a good starting point? My car has 144k miles on it, is stock (with Stage 1 AP tune), has the original turbo. This list comes from reading this and other threads that identify some of the causes of turbo/engine failures. I've done TB/WP already.
3k OCI w/ good oil (Rotella T6 is what I use)
Clean/Remove banjo filter screens
Clean/replace OCVs
Replace oil line with the Infamous one
Use the larger Mazda oil filter
Get off the stock tune (done, but is a custom e-tune better?)
Should I go as far as replacing the turbo now since it has so many miles on it? I'm very content with the performance of the car now. If I do replace it, would I be better off getting a rebuilt VF40 or getting a VF52 or BNR16g and a nice safe tune? I know I won't see the full potential of those turbos, which I'm fine with, just want something more reliable. I'd love to see this car hit 200k+. I love my car, and want to keep it as long as possible.