Right guys. There are a lot of very close to the correct answer now. The year is one out. Cars are correct. Not got that exhaust yet. The very last clue (because if you google search the last clue you'll get it). The company address for the exhaust company is 6-5 Kaminoshimacho Kita Yao City Osaka, Japan 581-0845. Right, that's it folks.
The very best of luck to ya,
SuperjakkoTM