All good points, thanks for all the contributions to this thread so far. Keep them coming!
Interchangability and availability ranks top 3 of my favorite things about these cars! Very easy to find virtually any part you need. And there is demand for any part you desire to sell.
I preventatively replaced my DISA valve with a new OEM unit for $240. Sold my perfectly functioning, but aging 60k mile DISA valve for $120 on e46f to someone who needed it but didn't want to buy new. He was happy, I was happy. I'm not aware of other cars with this type of market for parts!
On the hunt for the cleanest lowest mileage ZHP sedan!