Sorry, I phrased that wrong, I should of said I've seen a few topics in the past and dyno prints outs of a very slight difference low down, but even tested back-to-back on the same day the effects are not really noticable in real world terms.
Just look at it this way, a K04 RamAir CAI is £190 (actually £171 with the 10% off) where as the VW Racing intake is £420+! The reason I would consider the VWR intake over the others is it has one less bend in it as it's attached in the OE position, thus one less restriction on air flow. But again, only in big BHP chases is this an issue.
Even just a panel filter is £22.50 after the discount! That's insanely cheap for what is going to be a great filter.