Ever wondered what kind of a difference it would make to a supersport-level machine's performance on track when one modifies it? Hopefully this will help answer your question.

On the left is my Triumph with a bunch of newly installed performance modifications: Power Commander 5 + Ignition Module + Secondary Fuel Module, Custom made CNC Velocity stacks, a decat header pipe (making it kind of a full system exhaust when combined with the slip-on, with exhaust servo deactivated with a Servo Buddy unit), and BMC Air Filter, all dyno tuned for about 10hp gain at the maximum, through a large chunk of the midrange. Peak power is only up about 3hp due to stock cams and the stock-diameter exhaust header. On the right is the same Triumph taken from one my earlier laps before the modifications took place, fitted only with an Arrow Slip-on from the Triumph accessory catalog (with the dealer's 'Slip-on fuel map') and absolutely everything else stock.

The lap times are essentially the same at 1:44. Personally I'm seeing about a 0.2-0.4 second advantage at the end of each longer straight. I also see most of the gains occurring around corner exits where the modified bike gaps the unmodified one quite quickly at first, gradually reducing in gap rate as the revs and speeds build. I'm guessing it should equate to anything between a 1 and 1.5 second advantage overall per lap assuming everything else was constant (with this particular bike, and this particular rider, on this particular track). As always, YMMV, but I hope you found this informative.

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