What power should be expected with these mods on an AU XR8 s2?

[redauxr8]

Yeh well hey guys i have a 3inch full lukey system, with pacemaker headers, custom made air intake, electronic shiftkit and new plugs/leads on my au xr8 (auto).
Wat power gains should i be expecting and does anybody have any further ideas/prices for further mods? Also im looking for mods that i can run for a full year before getting custom tuned... as the nearest dyno is like lightyears away...

Cheers guys