is your car the std 200ps GTI or an ed 30.
If they have truly got her to 270hp, its very likely you have a full TBE, Air intake and fuel pump, possibly intercooler.
270Hp is very nearly a maxed out 200ps k03 engine.
what are your mods, do you know.
Alot of guys have used the new D Revision DV and they are a lot better quality than the older diaphragm styled DVs which were flawed. they are a much cheaper option than the Forge(bout £45 iirc).
an alternate whoosh which IMO is less chavvy is a good open cone air intake such as ITG/Evoms/BSH trueseal.thwy give off distinctive noises that are not chavvy instyle atall. i previously had the fprge blow off spacer on my car but removed it as it was embarrassing at low town speeds