Hi guys! New to the forums. I have a 2015 lt rs 6 speed. Installed the k&n intake and the predator 2 ram air hood. I'm looking into the trifecta tune, and wonder what the difference is between a stock exhaust, or say straight piped/cat less on the advantage + tune. Is there a noticeable difference? I understand the dynamics of free flow and spool and what not, but is it a difference enough to spend the money on a daily? 20whp difference? I'm not 100% on these cars yet. Please enlighten me or feel free to comment!