An update on a few things.
I've added to the grill block now that it's getting colder(highs around 55F lately). I filled the middle opening and added partial covers over the ends(engine air intake is on the drivers side). Even after the blocks it still leaves about 48sq in of intake for the engine. which according to the nascar 4sq in per 25hp should be good for a 300hp engine. Haven't had time to fully test it but I took it from a cold start around the block and it looks like it will take a little over 2miles for it to warm up(was 55F at the time).
I'm also headed up to Minn this weekend so I'm running a test with cardboard covering over the opening to the rear bumper. I figure now that I have the flow traveling down most of the way It's probably affecting the mileage more then before.
