The speed limiter can be easily removed. The best
mods for an Evo would be a boost controller, remap and hybrid turbo this could see in the region of 400-600 bhp depending on how aggresive you set the
mods. The Evo is a great track day weapon and you will not be dissapointed. On track days it is the handling and acceleration which make the difference rather than having a high top speed, so tweak it for max BHP get the limiter removed and you can start having fun.