9psi 2bar? Not sure what you mean by that, there's about 14psi to one bar...
Anyway, basically, if you have a setup where the air inlet pipe is getting hot then you will benifit from cooling but otherwise it will mainly be the extra fuel that will give you more power. I see and increase of 20bhp from 195bhp to 215bhp on a 1.9 diesel Vectra. I don't know if you'll see the same sort of percentage rise but you should see enough gain to make a difference.
Personally, I think you are being greedy and you should give me some of your ponies!
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Vectra 1.9CDTI 235whp/380lbft (270bhp/405lbft) NOS+Methanol
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