Offroad-Express

Hi guys.
I'm wanting to get a new exhaust fitted to my LJ78, hoping to get abit more out of it and keep the temp down too. I have been told 2.5" is the way to go. I'm out west Auckland. Where's the best place to get it done? What sort of $ am I looking at?

Thanks Slacker

I used a place in Kumeu how ever I do my own work now....
I am sure some other Westies can recommend a place to go to....