The last major component in the system is a rear resonator. This isn't always necessary, however I do a lot of highway miles and droning etc is a pain.
There were no rear resonators available that fit at the rear of an AU and have twin 2.5 inch inlet and outlet. The best solution found was to take a Genie Super Turbo twin-pipe resonator, bore it out and take out the twin pipes, and then insert the required twin 2.5 inch stainless holed tubes.
Whilst this shot shows the resonator already partially fitted, it is clear how the conversion was done. The holed pipe was run to the end flanges to allow easy TIG welding of the pipes at each end.