I went to a car exhaust shop and got two 1.2m lengths of 2" diameter stainless exhaust tube. Got them to taper one end down to 1 3/4" so it would fit over the headers. Couple cuts here and there, some high temp paint, zorst wrap etc and you're in business. I put baffles in as well so total spend was about A$350 but it would be about A$250 without baffles. An aftermarket exhaust goes for about A$1000 here so I'm happy. It's not for everyone (LOUD !!) but I like to do stuff myself.
TTT.