After a calibration to suit S&S 585 cams or similar with 10.4:1 CR no change to heads or throttle body. Don't want spark too advanced as wanting to run on 95ron fuel ok when 98 isn't available. Running a v&h quiet baffled 2-2 pipe but just after a reasonably close calibration to start with. Bike is a 2007 softail with cable throttle. Thanks.