Everyone's different. Had mine 3 and half years completely standard, loved it, then I joined up here and went to a meet . Just seeing how other people had modded their Zed's inspired me to get a few fairly basic mods, rear spoiler, spacers, nothing that dramatic. Probably do a few more subtle mods before next years meeting season starts though . I personally won't be touching the engine, just be wasted on me, but plenty here have had their pre 06 engines remapped, etc and have squeezed 30 or so BHP out of them at a reasonable cost. A couple of people here have gone down the nitrous route too for even more power .
Anyway, enjoy the car for a day or two first and welcome.
Pete