Vy V6 ecotec swap to a Alloytec whats involved?

[VT II Executive]

Constant 9.5L's/100km out of our L67 for the weekly run. 750+ on a trip. Untuned and over 300,000kms so far.

Damn, thats good for a super six, my mums Bf MKII fairmont gets 13l/100km, it’s only done 200,000kms of country driving!