Found one for the older models but can't find one for the newer. When I was tuning my 19 I found it ran almost exactly the same with just the spark arrestor removed with the K&N and fuel controller as it did when I added the pipe. So if I keep this 18 don't think I'm gonna spend the cash for little to no performance gain. But I do have to have a spark arrestor just a more free flowing one.
This Billet performance spark arrestor core replaces the very restrictive spark arrestor core on your OEM Yamaha exhaust system increasing your rides overall performance and sound. This is a simple bolt on performance part that installs on your ATV in just minutes (NO DRILLING REQUIRED).