250r update and mods, any other suggestions

A buddy of mine has a KTM RC390 and did a few mods like removing the catalyst from the stock pipe.

He installed a Power Commander with a map from a company that tunes the RC390 engines, and says it has made a significant difference.

Not sure if the CBR would respond the same way. It depends somewhat on just how good or bad the original mapping is and how good of a tuned map you can get.

We messed around with the PC and a few different maps for my son's R6 at one point, and it's a bit of trial and error getting a good one without doing actual dyno tuning.

See if you can find articles by Ari Henning, formerly of Motorcyclist Magazine. He raced a CBR250R for a while, and I believe he modded it along the way. Eventually he came to the conclusion that it was holding him back no matter what he did - which is the truth.

It's a decent cycle, but was not designed as a sport or race bike.

There's only so much you can do.