As far as I was aware, these types of intakes are only any good on an Na if you are going Na-T.
I believe the purpose of this type of intake on the Na-T is to allow for a shorter run of intercooling pipework, TT style, so you don't have to route the pipework from the intercooler outlet back across the car to the offside (plus the benefit of removing the pipework from the top of the engine where its hot!) and you can run a larger throttle body, which are both mods which benefit a turbo, but not necessarily an Na.
The Na Induction piping is tuned in length to create more torque (and there's a valve in there somewhere to shut off 1 of the runners where it splits into 2), so I believe if your gonna mount this on an Na your gonna see a marked loss in low end torque in trade off for a bit of top end power.(There was a thread on this a while ago, I'll see if I can find it)
I'm not saying your "doing it wrong", just interested in what your trying to achieve and the gains you hope to make.
Are you gonna Dyno it before and after the mod so the results can be quantified?