Austin Racing uses Inconel which is superior to Titanium and Stainless Steel.
Just out of curiosity, what do you consider the "superior" aspects to be with Inconel as the material for a motorcycle exhaust?
I understand that it can withstand high temps and has more corrosion prevention than the other materials. But it is very difficult to work with and much more expensive. And I've not seen very much in terms of weight comparison. So in my feeble head, putting a more expensive exhaust on a motorcycle that will get scratched up or damaged when it falls over doesn't make much sense. Especially if it's going to possibly weigh more, be obnoxiously loud, not produce a big power gain, and doesn't look good on the bike.
But glad you're happy with it and that's what's important!