@Elan-n Agree with @calum about the Zeeltronic, I enjoyed the process of installing mine and making it look as stock as possible.
Re jetting, I think I'd be contacting Romeu Henriques, tell him about your other mods (intake spacer dimensions etc.) and see what he says. Everyone speaks very highly of his exhaust systems so he will probably have enough knowledge to plug the numbers into some two-stroke tuning equations and help you out.