Clint at Vetterman's did change the angle of the heat muff inlet/outlets slightly after he did mine, so other people should have a more direct routing of the SCAT tubes. If I find a reason to some day, he'll swap them with me.
I'll be curious to see how the exhaust does with the tunnel walls too. There is a good amount of clearance there, actually, but, it's been a while since I've dealt with the 4-bangers. The IO-540 does a shutdown shake too, but I'm not sure if it will be harsh enough that it'll actually touch, on the -14.
The short of it is, I personally dislike the whole "Tunnel" idea on the -14 anyway. I think the cowl should have come down lower and the exhaust should come out the bottom just as it does on the -10. The tunnel itself is an eyesore from the bottom, and being made out of stainless, I don't think I'll paint it because the paint won't stick as well, and even if it did, it's going to have a hot exhaust pipe stuffed into it that would probably discolor the paint anyway unless there's plenty of airflow to prevent it. I guess we'll see after time.