Since purchasing my 2014 Audi A4 in October, the only thing that I have done to it so far (besides putting on winter tires) is change the air filter. I got a re-usable aftermarket air filter from tdotperformance.ca. It is an AEM DryFlow Air Filter and came out to $60 shipped to my door. This is more expensive than a regular air filter, but it will pay off in the long run as it will never have to be replaced.
Check out my youtube video of the install, it is really simple and can be done in about 30 minutes with common hand tools. Subscribe to my channel for more Audi content in the future.
I am going to be de-badging the A4 and quattro badges on the rear bumper. I will also be getting a tune installed in the spring/summer and test out the 0-60 times before and after! Possibly might do an exhaust as well and some nicer rims and tires!