Audi VW .TFSi Tuning We look at the stunning vw audi group . TFSi engine as fitted to the TTRS and RS models. These engines cope with massive power gains so we look at the best upgrades and modifications for these engines..The B chassis Audi A is a good looking saloon, but the factory styling is a bit bland, and the . TFSI could extra oomph the best mods for B Audi A.Audi Performance Parts Tuning at Eurotek Tuning in Las Vegas Not only do we sell Audi Performance Parts, we also perform installs, upgrades and tunes at our shop in Las Vegas. We have a full service facility so in addition to Audi performance mods and upgrades, we also offer maintenance and repair services… Body Mods. The days of body kits and gaudy body modifications is over. Keeping an OEM look is the way to go. The B body came in two different options, an S Line and a Non S Line. All vehicles had an S Line exterior but were not “true” S Lines. The easiest way to tell if you have an S Line or Non S Line exterior is to look at your fog lights..