Just purely out of the curiosity and to keep within my budget, I have decided to do this in two stages:

Stage 1: Bigger condenser and dual fans sticking with R134a.
I want to see what immediate difference it makes with R134a with the small upgrade. Since the later condenser is still the same tube and fin design, I can simply flush it clean when moving onto stage 2

Stage 2: 17cc compressor and R12.

Will update soon with Stage 1 progression! Awaiting the condenser in the mail.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k