As long as your kit exhaust matched up to the 28mm header then you will see some performance improvement. Homoet is a great pipe company I would definitely trust in their quality. But a circuit is a circuit, and its performance is low to mid range. They usually top out at about 10k rpm. If you pair it with some smaller rear gearing it can get you some better speeds.
Losing a center stand is nothing to scoff at either. Losing the ability to start your bike on the stand can be tough. Especially if you are going to be tuning. I'm just speaking from experience.