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Cheers mate - much appreciated.BigJim posted the number in this thread mate
http://forums.justcommodores.com.au/threads/vf-ii-sound-enhancer.250137/page-2#post-2849096
Interesting. If anyone gets this done I would like to know more
A mate with his VF SSV has the Walkinshaw 375KW done from the Holden dealer, and is ranting on about a oil that he must use, or it will void the warranty, I said BS ! and looked that oil up, it's only for E85 fuel. I don't think they the VF can run on E85 as Holden only did that for a few years and then puled out due to the extra cost it added to a new car.CHECK THE FINE PRINT!!! i think you will find that most Walkinshaw mods void the manufactures warranty which is then replaced with the Walkinshaw warranty which is not as comprehensive as Holdens.
But i may be wrong
Keep in mind there are two versions of the R8 headers (non supercharged of course) The R8 has 2.25inch outlet on the headers for the 317kw model and the R8SV has the 2.5 inch outlet which is the 340kw model. The R8SV headers are rare indeed.
OK. Just saying if you wanted to improve the torque spread the stock 2.25" would be better. The SV is 2.5" for top end HP.I certainly did not have this issue.
Going from standard log manifold to the 2.5 inch headers improved my torque
Not dyno proven but I know my car well enough to tell