can anyone tell me what i need to do fuelwise if i put slip on mufflers and vance and hines air cleaner on my 07 fxst..I would like to stay with oxygen sensors etc not pc3 etc.Do i have to go an aftermarket computer or can the local shop tickle up my factory computer?Anyone offer me some advice?

should of clarified my current situation.

have big radius 2-2 and pc3 and drak aircleaner by v&h

sick of spending good money at the local stealerfor tuning only  to have it pop and fart on decel etc and its now started to backfire on startup only in the afternoons after sitting at work for the day(11hours).thats the reason why im thinking of changing exhaust.

i might see if someones got a dynoed map for a bike the same as mine and download it