FMIC, pod filter, boost tee upping it to 10PSi, spark plugs are gapped to 0.8 instead of 1.0. 18x8 wheels, 3" Xforce zaust with 3.5" tip, 200CPi metal venom high flow cat.
Japan is definitely on my list of places to go. The missus has come up with a great idea to save and go to japan for a week or two for our honeymoon in years to come.
I had a xforce ( http://www.xforce.com.au/products.php?make=Nissan&model=3) with the oval resonator and excluding cat installed after I was rear ended last year. If I recall it was $900. Doesn't sound too bad just recently replaced stock cat with a steel high flow venom 4.25" cat and it sounds pretty good with it. (Due to over fueling it is now popping flames though). If your going to upgrade the zaust wouldn't hurt replacing your down pipe as well (if still stock) for better air flow.