Removing that flat spot is the main reason why folk have the work done. Extra power is nice to have. So much extra power is unexpected.
The engines run very weak as standard and can be harmfully weak with some exhaust systems. Generally the ECU will adapt to new header and silencer but not a free flowing air filter as well. But, some super free flowing exhausts can be too much leading to harmfully weak mixtures.
Information from Geoff when I asked about fitting the Akraprovic 2:1:2 stacked silencer system. He advised me to not run it without baffles on the OEM ECU map.
Thanks for your advice.
Just for your info, I used to run my own motorcycle tuning shop and had a Dynojet 250i rolling road so am familiar with tuning the GSs. Back then (2008) all we had were Power Commanders which just sat on top of the existing ECU signals to the injectors (ie fuelling adjustment) and spark plugs (ignition adjustment) and either lengthened or shortened the duration of the pulses to the injectors to richen or lean out the mixtures at various areas in the operating map. So it was very much a compromise. An improvement yes but a compromise. We (I) didn't have the capability then to get into the ECU and set definitive air-fuel parameters etc etc as it appears that Geoff in Hilltop van now do.
I don't have the dyno anymore (the financial crash in 2008/2009 saw to that) but am still curious how well that flat spot can be bettered.
Fergus