Harrop 2300 supercharger to Optimiser 6500

[PeeBee]

Eh? Im think as in a DPF, for exhaust.?? Surely not.

Whatever it is called, its in the exhaust pipe, as close to the engine as possible, has to be at least a 100 cell/inch 2 unit, the VASS engineer made me go to 200 as the law will be 200 within 12 months, so may as well be ready for it. Its a Catalytic converter, but for diesel. This is what is installed.
https://www.ebay.com.au/itm/3-INCH-2...72.m2749.l2649