In 2010 I had my 09 SERG origanally tuned at dealer, Only mods are 09 OEM open header pipe, SEST PRO pt# 32109-08B OEM MUFF body's w/ Cycle Shack baffles, stock cams. The Dealer had Rev Limiter set @ 6200 rpm, This June I swapped the OEM muffs for V&H slip ons and developed a stumble of idle & decel pop @2000-2100 rpm,
I recently had the bike retuned at a tuner that just tunes bikes, he provides no other aftermarket services. While he was doing the base line runs he recommended readjusting the rev limiter to 5750. his explanation for this the way I think I understood it, "AND I AM BY NO MEANS A ROCKET SCIENTEST" was that the TQ starts dropping around 4000 rpm and not making much efficient power beyond that rpm! Decel pop is gone no more stumble off idle, also idles much smother while sitting at red lights! TUNEING EXPERTS OPPINIONS PLEASE