Slight tuning issue
 

does anyone know if the jardine rt-one dual outlet slip on have the same tuning specs as the rt-one single outlet? i.e. back pressure and power output

that would probably be a better question for Jardine. Email or call there technical service. But, if you actually dyno tuned one pipe, then switched, its hard to say 100 percent for sure that it would be the same. Generally, to get the most out of it would require a re-tune. But for just slip-ons, they are probably close enough that you wouldn't notice any difference.