The guys at G56 told me they tried several different sizes and shapes for their system before finalising on what they sell now. They think that their system is the most compact but effective absorption system you can have. There are smaller ones but they are also quite a lot louder. There are enough G56 systems about now for them to be considered "normal". You could ask them for no heat shields and studs maybe Obie? The outer surface of the exhaust, particularly further back doesn't get very hot. Paul Rand has fitted a closer fitting heat shield to his G56 system.
