...BTW your Bieber avatar is awesome.-Malone
IDK, Looks to me like #1 would lose the battle for fighting for air. That is if the inside is open just like the reg. 1.6 TD intake. And 2 and 3 look like they would still get the most of it as their runners look 2" shorter than 1 and 4. I think it would be better in the fact that it is longer runners than the standard TD intake, but not much that is why I am building mine not buying one of these.I would still like to see #s just like you Kevin. I could be way off on my guess and want it to be confirmed either way.
The data I've seen indicates that in order for the intake runners to be of any harmonic benefit to a tdi engine, they would have to be over 30 cm long. Plus, the use of a turbo basically negates any benefit of a tuned intake system. As far as the benefits of unequal runner lengths in the new VW intakes, I have not seen any hard data yet.
I have used the stock TD, PD160 and 1Y manifolds all on 1.9 TD engines, and I would say that the 1Y kicks butt over the others, but on my mk3, with everything else the same, the PD150 manifold gave me about an extra 5-8whp (dyno'd). That was on an engine making 125whp.