The 3 inch systems have been built for both road & track Zeds. They have a deep, quiet 'burble' while allowing for full gas flow. And they sit up nice & high so they don't get caught on anything...
We now have a jig for the 3 inch system which will allow time & cost to be reduced.
We haven't 'jigged' a 2.5inch system, as we actually don't do many of them in that size, but if an interstate customer wanted one, I'm sure we could work something out
Cost wise, it would be around the $1000.00 mark for a 2.5 inch system.
Bare in mind, the systems we've built have been mated up to the SW Motorsport style extractors, so if you wanted to use a different style of header, we'd need the car.
I don't know of anyone on Sydney who I can recommend, sorry. Maybe try SW Motorsport?
In any case I'm happy to freight exhaust systems