****UPDATE****
So I got the FISCH spark arrestors in and was little concerned with the reduction in inside diameter for the size that fit the 2 Stroke exhaust pipe. Well I took the time to install the larger one in my 200rr and installation was super simple. Packaging was great with Allen key and lock-tite supplied. Took it out for a ride and the entire ride I was feeling like the bike was just a little flat. Got out on in the grass field and rapped out the gears and it was falling on it's face in 5/6 gear at 1/4 throttle and then cracking wide open.
I thought maybe it was the temp increase over the last few weeks that got me in trouble with jetting. Then I remembered I had installed this arrestor and proceeded to remove it and go back out for another test. Well front wheel was coming up in every gear through 5th.
Consensus is this restricts the tuned flow of the exhaust too much to run it in a 2 Stroke bike with factory exhaust. Pretty unfortunate as it would have been a great alternative to the $225 FMF slip on. Now I have a $75 paper weight to hold the receipt down from my FMF when I'm unboxing and installing it. EPIC FAIL