Headers or Test pipes or both with stock exhaust?

After_Shock

We don't have emissions tests in the Dubai (well we do but they never use them) its just noise and altering from standard are the issues.

Some crazy modified cars exist out here but you do need to know someone within the registration/licensing department or pay sill money in order to get away with it. Alternatively you can just be lucky and they wont notice, but im not from here so they will notice lol

Will do more research into the shorty headers with test pipes or the long tubes. From past experience tuning LS2's im assuming the same rules apply with this engine, the long tubes will add more to the top end but lose a touch at the the lower rpm's?

I rarely extend the car to the higher RPM's so if the long ones lose power low down I think it will make my mind up for the shorties and test pipes.