My only concern is that you've gone too far on blocking off the air. A $1,000 to $3,500 repair bill does not offset the .5mpg you might be saving by letting in a bit more air down low.
Another "Hot" tip, form a guy who's been there, Change Your Thermostat!!! Cheap and easy to do, crazy easy, and it could save you the $1,000 to $3,500 repair bill if it overheats. Mine went out on me in Atlanta last spring and made a leak in my head gasket which is almost certain to happen when it over heats. It was due for a new timing belt anyway so I combined the 2 repairs and got away for $1,200. But in the back of my mind I always wonder if a screw wasn't tightened just right and I'm left walkin.
But I digress.....
Excellent job otherwise in all respects on you great HX!!
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