The GT3 System, so-called because it resembles the GT3 race-car layout, requires the removal of the rear grille panels and number-plate plinth. You need a Panel Eliminator Kit (think about it), to support the rear edge of the diffuser. The 2bular PEK consists of a pair of Stainless turnbuckles and a laser-cut number-plate bracket – see pics below.

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I take a straight shot off the Cat pipe, no "S" bend up to the silencer, keep it low. This allows a full 24" silencer length to sit between the diffuser tunnels and the tailpipe to have a natural up-sweep.
If you don't need to meet any noise limits, the 6"dia x 18" has a wonderful exhaust scream on 2nd cam.