John, this where I got my exhaust and they are highly recommended by all the guys in the USA. I got the Magnaflow dual system and it is plenty loud enough. However you should hear it when it gets
REALLY ANGRY 
man o man it sounds like a race car
.
http://www.trubendz.com/home.asp?pro...e=productIndex
This modification is easily the best value for money you can get.
Where else are you going to get a 2.5inch stainless system fully installed for about A$1200.00 ???
The only problem is that you won't be able to hear the engine "growl" anymore because of the racket from the exhaust.....but it's worth it.
Now when I "light" mine up it gets very noisy...............
Get in touch with them as they are easy to deal with as long as you have paypal you will not have a problem.