Here is a link to my thread which has more details about the mods I had done, and also a couple of pics I took this morning, just FYI.
http://www.fordforums.com/showthread.php?t=88347
To answer the question re fuel consumption: the harder you drive it, the more you use. Simple. And with new mods, its hard not to drive it harder, around town and therefore use more fuel. Especially when the harder you push it, the nicer it sounds...
However, ALL THINGS BEING EQUAL, the fuel economy is rather improved from what I can tell so far. On the way over to Melbourne from Adelaide I avereaged around 12.1 L per 100km. On the way back I got 9.8. Now obviously there may have been differences in my driving on both trips so its not identical. But it was not substantially different either way. I stopped once, in Horsham, both ways. I sat on between 100 and 130kmh the entire way except for towns. Traffic was similar both ways. So thats the info on fuel economy I have so far. Have not taken much notice around town yet, I'll wait for the next tank.
Re the rwkw, I find it very difficult to believe that with just exhaust mods and a chip on a BA 6 you could get it to 180rwkw, which is similar to XR6T rw power. Without doing cams and other stuff, I just cannot see it. And at the end of the day, you would feel it if it was. I have driven enough XR6Ts (manual and auto) enough to know what that kind of power feels like.
And the Nm issue is not that clear cut either. Before my exhaust mods, the dyno gave an ESTIMATE of a tiny bit under 400Nm. Now with the exhaust mods, I am not sure since I have not had the Nm measured, and on a dyno it is only an estimate anyway. However, if the dyno was correct with 180rwkw, I am wondering what it would show re Nm, if it is measured... would it show THAT far off 450Nm of an XR6T?
In any case, despite mine showing as 182rwkw on one dyno, and despite the fact it does feel and sound much better, it does not feel anything like a stock XR6T and that is a fact. I know the difference well and no one can convince me that its what it feels like, even Nm aside. What it does have is a much better pull in higher revs than before, more power across the board and a really nice sound to it. Not too loud, does not drone inside and it doesnt sound cheap and tacky.
My opinion re the rwkw/dyno issue is pretty much what Casper and others have said. The only issue I have with it is as CSV said in that it could very well be false and misleading conduct in the course of carrying on trade or commerce under the Trade Practices legislation, but since they never claim the figure is NOT from their dyno, it is probably difficult to argue that, technically. I do think it is misleading however, as in a practical situation, people would expect that figure on all dynos, and therefore expect relative performance on a track....
Aside from that, if you want such mods done, go into it with your eyes open, with realistic expectations of the results you will get, with some research under your belt and with an attitude that is less focussed on the rwkw/dyno figure than the actual performance and feel of the mods themselves.
Any dyno can be set to tell you your Focus has 200rwkw, if the users so choose to. But that doesnt count. If it does not go relatively that fast on a track, then the figures are pointless. The dyno means nothing when it comes to how it feels and the fun you can have with it.
Just be realistic and enjoy what you have.... as long as it beats Commies, and you get a decent track time (which any 14.xx in a NA BA 6 is IMO - I would be happy to get that time two weeks from now) then its all good, right?