I got 209k on mine right now. Thinking i might just do the CP3 pump at my next Tbelt since im in there. Also, would a CP3 pump be a good upgrade when doing power upgrades, for example, CR170 turbo upgrade?
If you are diligent about your maintenance and inspect your fuel filter canister during religious filter changes, I would suggest you let it go until it shows signs of issues. We have better fuel quality up here then they do down there (as a generic statement).... now this doesn't mean that you can't potentially go to a shady station that hasn't been maintaining their tanks and potentially end up with contaminated fuel (or water, etc). Unfortunately, we don't have any control over that.
I have personally kept (and continue to do so) every single receipt from every single tank of diesel I've purchased over the last 12 years.
I also go out of my way to only fill up at a few "usual" stations, unless ofcourse I'm on some roadtrip and can't control that.
I also use a lubricity additive, which many people tell me is snake oil, etc..... (and not a good value)
In my perspective, it's much easier to absorb spending a few extra $s with every fillup, than to spring for a one time cost HPFP replacement or/retrofit that will run me $$$$s instead.
Even if you do a CP3 conversion, you're basically only making the pump more tolerant to crappy quality fuel/lubrication..... the injectors will still go to crap if you end up with junk fuel or any debris that the CP3 might tolerate..... so it's a bit of a fake security approach in my opinion.
Lastly, yes, the CP3 will outflow the CP4.1 as it has 3 pumping heads vs 1, so it will provide more fuel if you reach the limits of the 4.1 due to upgrades.