Ive been working with an automotive audio guy the last few weeks incorporating a waveguide into or on the A Pillar.
I've been working with PHASS drivers. The AT58C which reminds me a lot of the N26C. This one we are working on building into the A-Pillar so all I need to come up with is the guide and mounting it to the driver. I'm also working with the DTM25C. This is a Neo diamond version of the AT58C.
I made up a test model so I could reproduce some of the reflections that you get in an automobile. I was surprised at how bad they are. Basically I was trying to eliminate some of the first reflections and have the spl level drop off fairly quick off axis to help with the reflections. Rather then post all my results you can go here and look if you like.
https://plus.google.com/photos/10163...081?banner=pwa
Here is a pic of my test set up.
AT58C in a mock up baffle
Driver on a flat baffle 10x14
Driver in a 4"x3" Guide. Waveguide is raised off the baffle just ease of testing 
Dave
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