AT 3,800 miles both cats failed and dealer replaced under warranty. Done several trackdays and every session ends the same way. Flashing check engine light, poor performance and when I limp the car back to the pits and pull codes get #8 misfire, random misfire and the cam bank2 and the intermittent bank2. I already tried using 91 octane fuel to see if it was a knock sensor issue and pulling all the timing it could out of the engine but not being enough and codes were set. The dealer installed 5W-30 oil and I think it was better but it was a cooler day than when it last occurred. Any suggestions?