i have just fitted my new stubby can on my rs,i bolted it straight on ,it sounds awesome,i dont think it needs remapped,how do you know if it needs a remap.
Several things could indicate it needs a remap - flat spots, worse fuel consumption, running hot, stalling, smoking etc. Not a techie but those are the things I have come across which have been cured by a remapi have just fitted my new stubby can on my rs,i bolted it straight on ,it sounds awesome,i dont think it needs remapped,how do you know if it needs a remap.