2005 holden commodore Vz need help on peformence

[vz23kq]

i have had my 2.5 xforce exhust stright from the Cat installed a month back, My car HAS dropped power on low revs but on high revs it gains Shitloads of power. i need to no from anyone who has done this to there car,
what else should i be looking at buying?
such as Hurrican extractors, and 2.5 CAT CONVERTER ??
would these 2 things help gain that power back?

[doms1]

i have had my 2.5 xforce exhust stright from the Cat installed a month back, My car HAS dropped power on low revs but on high revs it gains Shitloads of power. i need to no from anyone who has done this to there car,
what else should i be looking at buying?
such as Hurrican extractors, and 2.5 CAT CONVERTER ??
would these 2 things help gain that power back?

A new more performance oriented car

[wikky]

There's a sticky at the top of the VZ section about mods for the VZ with everything you need to know.