Literally any questions you guys have on boost, parts for boost or anything like that, I can answer...
In regards to Neuspeed saying they wont tune your car if you have an aftermarket DV, thats just dumb. I ran a Stratmosphere DV (Forge also makes a great one) on my 1.8T with just an intake and it was perfectly fine. It's never a bad idea to upgrade anything, ya know? That way, if you want to go for software later, you have the aftermarket DV that can handle it, whereas the stock one can barely handle it and companies suggest you get an aftermarket one anyways at Stage 1+.
That being said, the best option for getting more horsepower from a 1.8T is software. It turns up the boost, optimizes the Air/Fuel Ratio and turns your car into a brand new beast. You dont have to have any mods to run software BUT obviously things like a Cold Air Intake, exhaust, and diverter valve really add to the software and allow the car to breathe better and move air through the system easier.
There are lots of companies out there who make software for the 1.8T but Neuspeed is NOT one of the well known ones. Brands like us (C2Motorsports), APR, GIAC, and Revo have put lots of time into research and development for this platform and have made a great product that shows significant gains for a great price.
Obviously I'm going to suggest C2
because we always love to help BUT take a look around, do some research and make an informed decision!