G'day I jut bought a 2003 ba xr6 n/a , full stock , leather , sunroof , 78,xxx k's. I've put in an aftermarket head unit and sounds system ( subs still yet to come ) and a growler induction , I want to get some more grunt of it so I was thinking peformace wise;

-extractors ( pacemaker 4490's or 4495's, or maybe another band ?)
- hi flow cat
- cat back
- big mouth induction to help the growler
- is it worth changing the intake pipe to stainless?
- 20% underdrive pulley
- flash tune

Just wanting some input into anything else worth doing to give it a bit more go and brands and prefences for mods cheers
(pics coming )

Try searching through the forums.
This gets asked all the time and has been discussed often.You pretty much summed up the correct mods commonly done . Also a sports exhaust is an obvious must have performance item.