When I sold this setup in the 4-door it had a NSW-legal engineers certificate and 12 months rego. That certificate won't be relevant anymore with the new chassis number unfortunately. Maybe the engineer would re-engineer what is effectively the same setup for a cheaper price but I wouldn't count on it.
When I got the engineers cert it was a great feeling driving around knowing it was completely legal. I was starting to get paranoid flicking the switch because the noise nearly doubled with the supercharger on
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