I have a 2008 FXSTC with 18,000 miles on her. I converted to the HD Stage 1 kit awhile ago and tonight while riding I felt the engine skip. Just a blip. One time. I got home and started checking wires, fuel, etc and when I looked at the Stage 1 HD air filter, the attached rubber gasket is all ripped up and there are pieces missing....hmmmm wonder where they went ? My buddy is running the K&N 1499 on his Softail and he said he loves it...hasn't ever had such a problem. He had another one that I bought for $ 35.00 ( I understand that's a good price ) MY QUESTION: How will I mount this now that I've already mounted the HD STAGE 1 ? What do I have to do ? Hope to hear from you all soon, because I'm not pushing rubber chips through my engine anymore so she's parked.