Depends where you go. Gifford Pinchot National Forest requires: All power saws and motor bikes are required to have an approved spark arrestor installed while operating on the national forest.
the square ones do have cats in them. see this pic: Mine's got square holes in the back, vin ends in 3653. purchased in NJ.
Strada right? Yup thems the cats! WOW....they take up a lotta space! Seeing that you are the only pcv/at enabled/installed TR owner thus far (including the VP of sales at Dynojet!) I vote you gut those fuggers and see what kinda flow you can get! Sucks that we have yet to see an aftermarket intake option! I tried to open up the top of the air box when installing my PCV to see what all that space was needed for...but it involved a lot more work than I wanted to deal with at the time. I felt around inside the filter area and it seemed to be a bit restrictive. I wonder what a "pod" filter would gain us? Not practical for deep water crossings but interesting to see none the less.
I know this is an old thread, but I did not all see this was definitely resolved. The chirping on my bike just escalated to the point that I had to address it. I pulled the spark arrestor out and lubed it with anti-sieze - no change. I then plugged the holes of the inner pipe by shoving surgical tubing around the perimeter of the inner pipe. GONE. The chirping is indeed a whistle as the gas flows by the holes in the inner pipe at just the right rate. Those holes are there to allow for removing the spark arrestor. I will need to find a more permanent solution obviously, but I thought I would share my discovery.
