Just bought my first Commodore !!

Hi all, just bought a 2004 Series II VY Equipe and am wondering what some good mods would be to do to it ?
I'm on my green Ps' so can't do any forced air induction mods, but keen to change the exhaust.

Keen to hear what everyone's done to their cars. Pics would be much appreciated.

BTW, I'm a second year apprentice mechanic so am pretty handy with the tools and not afraid to get my hands dirty doing mods myself.

Thanks in advance ;)