Everyone, I have great news. We've performed an installation of our HP Intercooler on our very own RedMist, my wife Aubrey's 2007 Sky RL. Drum roll please...
For those who would like to use our intercooler in SCCA competition, it can be installed with
ZERO modification to the rear black plastic shroud!

That's right, as was pointed out by an imaginative customer, the shroud actually will go back in without modification, as the amount of material we'd been suggesting installers remove is very slight. We have now verified this in our development shop. I will revise our instruction package to reflect this ironclad SCCA-legal installation style.
We're going to run RedMist in this configuration, as I am considering some SOLO competition for this car in the future. Naturally, I will seek input on my setup from you helpful SCCA racers here.
A big Thank You to everyone for your input on this subject!