Exhaust headers - has anyone bought the Akrapovic one?

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Do they make any difference - either on a stock or remapped bike...? 

Just wondering...

So, it comes down to return on investment for you. If you add the headers you should also get more airflow over stock and coupled with a reflash I expect you will get some more horsepower. You will almost assuredly lose fuel economy and whether or not that is important to you, it will still be a tangible difference. Will the increase in power be sufficient to justify the expense - again up to you. 

I personally don't believe in big-expense add-ons to get marginal gains in performance that, if measured on a track at our typical skill level, might result in a small lap time decrease. My preference would be to put the money in a different bike, but that is just me. If one is locked into one bike then the perspective may be different. Speaking of which, most modifications have neutral to negative impacts on resale value, but I suspect a set of Akra headers with reflash may have a neutral impact, i.e. on an RS I can't see it having a positive influence on resale value, despite the fact that it "looks good on paper".

So in summary, its the intangible differences that may be more important ... if the sound and feel are pleasing then the cost may absolutely be worth it, but that is an individual decision. 

I am in total agreement ^^^