Steve,
I have thought of installing the oil thermostat but it came out after I had already installed the shutters and I didn't want to go thru all the plumbing and purge procedure .However, the thought of less drain from the oil tank into the engine case is VERY appealing ! Is it really much less ? It doesn't take long for the oil in my tank to go below the dipstick (a few days unless I turn the prop when the oil is cold)
The gear and electric trim are the best mods. I sure wouldn't go back to stock.
The VG's eeeehhhh not much change there but they look cool. They did work well on my former Piper Pacer
Dick