seeking advice on cordless impact wrench

[Gelbster]

The other point in favor of Ryobi is that they have consistently stuck with the same format and connectors for each generation of batteries.So old tools that were originally sold with NiCads still work with newer Li-On batteries. By contrast B&D have frequently changed theirs and there is no compatibility so you get stuck with a good old tool, for which modern batteries are unavailable.
So if you are building a collection of cordless tools for multiple trades, Ryobi is a smart,inexpensive choice.
For the Boxster , a 'weak' cordless tool is surprisingly useful, as I mentioned. It will spin on the fastener finger-tight without risk of stripping threads.Then use a torque wrench and consider using Wicking grade Thread Locker afterwards. This is a big issue because the Porsche has many,many blind threaded holes in aluminum alloy castings- some torque values are less than 20ft lbs. Jake's excellent reference book has more info.