After researching this forum, in SA I emailed Carline at Marion for a quote for these parts: # AL5-5712, # T5713 and a chrome tip + clamps (Lukey) as some had said should only be about $300 installed or even less. Just a catback. This is what the quote came back at...

"The Lukey system for your Commodore, with tip , fully installed on your car $420:00"

Is that high for a bolton etc? Any other places I can try or buy from and just install myself being a bolt on? Cheers for any help.