It wont make a huge improvement just yet. The mixtures are pretty good even with a larger pulley.
That said, if you are seriously considering more mods then i woudl suggest that you start shopping around to see if you can get a good price.
Not sure who would do installs in Melb, but Bennica Motors have always been good for racing bits, especially on Alfas and other Italian cars. I think they do Autronics thoguh, and probably a bit rich for most people.
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