I have a pair of Ace Race Parts flex couplers for sale. They would be perfect for exhaust systems in tight spaces. We ended up not needing them on the exhaust system we built. These are the interlocking style for more strength and durability.
I have four Ace Race Parts 304 stainless steel V-band assemblies for sale. I bought a whole bunch of these direct from Ace Race for a new exhaust system I was building. After it was all finished I had four of them left over.