I spent an hour today fitting the #3 exhaust pipe. It has minimum clearance on the #3 intake tube and the rubber connector was in close proxitimy to the exhaust pipe. I opted to loosen the exhaust and intake tube then trim the rubber connector by 1/4". This provided a better fit. I will speak to Clinton at custom aircraft tomorrow. Not sure if anything can be done but will ask.
Fabricate supports for the exhaust tailpipe hangers using standard techniques.