I updated the overview again because of price changes in the S111 SC kit (lower price) and the BWR SC-kit & FF275 (higher prices). The conclusion that ‘The BWR kit is the cheapest solution for an increase in WHP and ft-lbs (peak and average race)’ is still valid, however the difference with the S111 Katana has become smaller.
Also it looks like a new SC-kit with intercooler (called NewCo SC w/IC for now in the overview in post #1) will become available (
New SC Kit.).
Based on the published dyno’s in the test phase of this kit, I included this kit in the overview. Based on this it looks like ‘the best bang for the buck’-award will go to this kit.