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Dont quote me but in NSW i dont think you need to get certificates as long as the engine displacement isnt more than 15% bigger from stock engine. You just need to notify RTA of the engine change.

Go with a Facelift EK1 GLi

Car = 6k
Sunroof = 1k
B18c = 5k

= 12k~ total and equivalent to a EK4 and even more