Changing exhaust headers & pipe, air filter/pods and different jets is fine, but understand there is always a trade off. You trade consistent performance throughout the rev range for peak power. That's fine if you're on the track and keeping it near redline 90% of the time.
If you want it done properly you need to dyno it to get your AFR's right. No point in burning a hole in your pistons. No two bikes, even of the same model, will ever respond 100% identically to the same changes either. All trial by error.
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