GSXR600
Here is a GSXR600 that had a Yosh box map on the standard
ECU.
In other words, a map "downloaded" onto the bikes computer, according
to what mods the bike had on it. And/or some dials played with to make it richer
or leaner. Then we mapped it using Tuning Link and a Power
Commander. See for yourself the difference, which in a nutshell is that we
analyse your bike and add or remove fuel accordingly. The Yosh box, with some
monkey turning knobs to make it richer or leaner is GUESSWORK at best. See for
yourself and you be the judge.
Below is a stock GSXR600 with a Yoshi pipe and a BMC filter. It was run with both the pipe and the filter. We then installed a Power Commander III and re mapped it using the tuning link software. Have a look at the difference.