What size exhaust from holden factory for vs s2 spac 5.0 ute

[executer]

Hi, just wondering , what size is the stock holden exhaust on a series 2 spac vs ute 5 litre?

Bought my ute 2 years ago, it has a 2.5 inch exhaust, but im not sure whether its a stock item or not. I want to get some headers and am not sure whether its worth changing the exhaust.

cheers

[greenfoam]

Stock would be 2.25 inch, I have the opinion that it's not worth getting headers unless for the sound (they sound a lot better but performance wise not so much)

[executer]

so, extractors dont make much of a difference? My exhaust measure out to 2.5 inch. i was told it was aftermarket. it sounds okay, just not loud enough. Maybe i should cut the resi out?