Just if anyone is interested, there's an Aluminium lightweight flywheel available for the 6G75:
http://www.ultrarev.com/Clutchmasters_Aluminum_Flywheel_Mitsbushi_Eclipse_ 3.8L_V6_2006_2007-p53528.html

Pricing for each unit is US$382.73 (AUD$399.37) plus shipping.

They don't list that they ship international, but I'm sure if you contacted them something could be arranged.

Just thought I'd put this up in case people were interested. :P

Oh, pricing was correct at time of posting.