^^^^ with CAI's its all about the flow (so I'm led to believe) and the Forge one don't do that as well as the others, ie 2 closed canisters, 1 of which faces to the side of the car and the other filling up with all sorts of detritus from the front. Form over function IMO.
No doubt someone with a graph will come along to prove me wrong. 
They will!
http://www.mk5golfgti.co.uk/forum/index.php?topic=9988.0
I'll raise you one there,
My own GTI ran like a sack of s### with a twintake on. Boost was all over the place. Never once consistent.
A few months later on a Dyno day I might add. We compared my own car (stock intake) on the dyno with an Audi A3 running forge twin take as well.
Both same year production, same exhausts on, both AXX engine, both DSG, Both on APR software. Mine made almost 9 kw's at the wheels more than the A3 with forge twin take.
Additionally, some logs I did early last year also indicated on my car to run way too lean and pushing the injectors out to the max.
This is the biggest issue we face running intakes on our MK5 golfs. Hence there are really on a handful that really improve and work.
As others have mentioned, Evoms, Neuspeed, VWR, ITG (the big daddy version), Volant (so far it seems to be working well)
I'm not able to provide any information about the new REVO intake. we don't have them, additionally they are way too expensive by the time we import them.
To give you an idea, at your current RRP on the Revo, by the time shipping, customs, duty and tax was to combined. We won't see much change from approx £590
btw keep up your diy videos etc, will help many a members on here
