A good set of standard depth and deep 1/4", 3/8" & 1/2" hex sockets, extensions, ratchets, a long breaker bar and wrenches is the best place to start. Tools to add from there would be torque wrenches, ratcheting combination wrenches (stubby, standard length and long GearWrench), long/standard length/shallow bit sockets (hex, torx, security torx, torx plus, triple square - with bit sockets I would only buy Snap-On), universal sockets, crowsfoot oxygen sensor sockets, flare wrenches (line wrenches), pry bars, torque extenders, pass-thru sockets....then there are impact tools and special tools; and before long you have big cabinet full of tools you can't live without.
The simple version is that there are fastener specific tools, application/assembly specific tools, tools that gain additional access, and tools that have different lengths, depths and articulations. As little space to work as there is with Audi's, the more tool options you have the better prepared you will be to do any project.
Without making this post too much longer here are two examples where having a variety of tools worked. Removing downpipes from the exhaust manifold I used stubby & short combination wrenches, ratcheting stubby combination wrenches, universal sockets, 3"/6"/12" extensions, 1/4" & 3/8" universal joints, a few different length 1/4" & 3/8" ratchets (with and without flex head) and a crowsfoot oxygen sensor socket. Removing and reinstalling the valve covers I used a shallow torx bit socket, a standard torx bit socket, a long torx bit socket (at the dip stick), 1-1/2" & 3" extensions, standard & long 1/4" ratchets and all of the cuss words. To put correct torque on the VC fasteners, specifically the rear fasteners, I bought this Precision Instruments 1/4" torque wrench
http://www.tooltopia.com/precision-i...-m1r200hx.aspx ; with this I was able to easily apply correct torque the rear VC fasteners.
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