Yah I was involved in that crazy crash! It was 1999. Except by some fate I didn't go down. I'll never forget it. One other guy and then Larry Denning of whom I just let past me into turn 8 crashed right in front of me! My bike went to full steering lock as I thought I would high side but luckily the rear tire hit Larrys downed bike and threw me back forward as I landed on the gas tank. I looked back and saw nothing but crashing bikes as guys were hitting the haybales! Oil was all over me & my bike.
I had a customer once tightened an O.E.M. Kawasaki filter on his 03 ZX6RR at my shop. He asked me if it was tight enough before he safety wired it and I thought it was good. He took it around Blackhawk for only 2 laps and crashed on the way into Turn 3 from the oil filter oring blowing out. I never did see it after it burnt up the bottome half of the bike. I have heard this happen on several different brand of filters.
I'm sure glad it hasn't happend to me.
One thing I have noticed is that usually some aftermarket filters have very little threads that actually grab onto the bolt threads of the engine. Looks scary to me. I used O.E.M., K&N, & Hiflofiltro filters with no problems.