Hey, guys I had to join this forum to chime in on this thread. I have a 13 SHO w/PP, K&N CAI, Dynamaxt cat. back exaust. I have 13k miles on it, I bought the LMS Tune in October, and since DAY 1 have had the same issues with the 93 tune. Hesitation/ surging after 4000 rpm (pretty bad at times)...