wideopen231 - I had a earlier design aftermarket SFI pg with the inside case liner. When I sent it to Reid for SFI recert 7 years ago, you had to send the insert along with the case to receive new SFI sticker. The earlier design case and liner worked together for your SFI cert. I ran the liner in mine, maybe try find 3 pounds elsewhere to save weight not related to SFI : ) Your carbon fiber idea cuts weight. Maybe run 1/3 gallon less fuel to reduce weight. Alan