Hi There,
You're in Adelaide I would give TRS a call and see if they can help. I got my pipes from them cheaper than I could buy them locally and that was including freight from SA. The important thing is the orientation of the pipes when you fit them to make sure you're not putting any additional torque on the pipes when you install them. Trying to twist the pipes to fit and putting them in places they don't want to go to will reduce the life more than most other things. Also look where they touch things, like maybe a part of the chassis or another static component, the engine does shake during some of its functionality, make sure nothing is to close to the pipes.