The low end (under 3500rpm) is a bear to tune even with the SERT, this motor does not like that RPM range at all!Keylor said:AS a matter of fact I do have a Stage I flash because I was running SE Slip ons, and a K&N Airfilter, and I've got VMOD's on it now. My Mids are ok .. It's the low end that I wan to tweak a bit if possible... otherwise it's good. very responsive.