Hi all! I have a 2011 5.7 with Gibson axle back. When I put the exhaust on I got the hemi fart between 1st and 2nd shift when giving it some gas. Recently I got a Diablo tuner, and have tried the 87, 91 and 93 octane tunes. With each tune, the higher the tune number, the more pronounced and longer the fart becomes, with the 91 and 93 also farting between 2nd and 3rd shifts. I’m running 93 octane gas. Does anyone know why the different tunes cause the farting to increase? Thanks!