Mind Train has been out of business for many years now… you might be able to find someone’s used set, but I haven’t seen any advertised in a long time…
I’ve read articles about people opening up their stock Ansas and modifying the flow path. I have not done this. I thought the goal was to try and cut down on the 2000-2500 RPM exhaust drone (sound).
My IMPRESSION and recollection is that it was a good bit of work, but didn’t really satisfy those few who did it. I may be wrong about the results. If my memory is faulty, I hope someone with actual experience can correct me…
Rocky