the 3.6 is a powerhouse.. just look at the vehicle's specs on vw, or even edmunds, i the 3.6 is a 280hp, 265lbs ft torque- it is most similar to a Maxima and thier powerful engines. the 2.0t is only 200 hp or so. So to answer your question, in my conclusion, the 3.6 would dust the 2.0t simply because the v6's max torque is around 2750 RPMs and holds poweruntil 6200 RPMS thats stock vs. stock.
a chipped passat would be a gain of about 18-50 more hp however, to get that max power, GIAC recommends an air intake, exhaust and a few other goodys.. it would be a close race, but with the added boost, and more power, i think the turbo will be a little quicker and probably fast in a quarter mile than the v6
Yeah, but if you look at it from the stand point that STOCK you'll be able to push that power, and not have to worry about warranties, turbo issues, etc... I'd say if you were just going for power the 3.6L V6 is better.
Now, 1.8T vs 2.8L V6 -- you're way better off with the 1.8T.
Engine weight is a factor that you need to consider too. Regardless, I would look into the 3.6 over the 2.0, especially based on the fact that the 3.6 can also be modified, and is most likely able to outrun my K04'd 1.8t B5 Passat stock!
I don't think there's much available for the 3.6 yet.
Neuspeed carries the Haldex Gen2 upgrade for 4Motion, but its 1,200.00
GIAC, APR, and Neuspeed chip the 2.0T - someone has the "double scroll" turbo for the 2.0T as well.
The 3.6 could benefit from the previous 15 degree VR6 products.
VF Engineering could put a superchagr kit on it - then you could push 400bhp on the 3.6 (at which point 4Motion might be a good idea).
a chipped 2.0t can put out over 300 ft-lbs with apr. giac should be more. if you do a good launch on both(3-4k), i'd say the 2.0t has the advantage. from a dead stop, the 3.6 would be better off the line. just my guess though.