You might have gotten better information if posting in the Fuel Economy section:
TDI Fuel Economy - TDIClub Forums. I do agree that any aftermarket intake on the stock engine is not worth the money.
Mufflerectomy is not going to help FE either, but it sure does make the TD sound a lot better!
Grill block & Frostheater will help get the engine up to temp and keep it there. Also Scangauge II, of course, so you can keep tabs on the temp and other things.