Now for the last installment of the MCAI. All that's left is to seal up the cowl area and button it back up!
Then I cranked up the engine - it works!
I read about the increased sound level due to where the intake is relocated and that's a fact. When the engine is under load the noise reminds me of my old 1957 Bel Air rod (350 ci Windsor block engine, big 4-barrell carb on top) when I tromped on it. Mac suggested I try some A/C filter media across the cabin air intake plenum to cut the noise level down and that finally made it to the top of the list. I bought a white/blue spun glass window unit air conditioner filter (they have no frame), folded it into quarters and simply wrapped it around the cabin air intake plenum and reinstalled the cowl.
There is a significant drop in the cabin noise level with the addition of the filter media - I measured the cabin noise level at about 85 dB with Rubi in the shop and full throttle on the skinny pedal. I couldn't believe the difference the four layers of filter media made. We have for sure reduced the cabin air flow to some extent, so I might need to use a higher cabin blower speed for the same air flow, but that's no big deal.
When the engine is not under load (like cruising on the Interstate), the noise isn't even noticeable. Changing the cabin air from outside to recirculate didn't seem to make any difference in the noise level.
Almost immediately I noticed the cabin air seemed to smell 'clean' for want of a better term - it's difficult to describe. We have owned expensive cars before with carbon air filters and I was absolutely reminded of that clean air sensation.
I have no idea if there is more engine power or better fuel economy, others have documented an improvement, at least in fuel economy. Any improvement no matter how miniscule is certainly welcomed.
What I'm really excited about is when we get on the trail with the MCAI - I have seen our under hood temperatures reach 122 degrees and that hot air is getting sucked into the engine (cool air is more dense than hot air, more air = more power.) No more hot air thanks to the MCAI. (Also we won't get a face full of dust from the air vents - that got really old.)