Everything I've ever done to this car in terms of maintenance and modifications is documented here, with links to details where appropriate. Note, the first table below lists the modifications that were already completed prior to me purchasing the car. The second table details everything I've done with it.

---

Changes prior to my ownership

Date	Description	Mileage	Shop / Installer	Notes
12/31/2014	APR Stage 1 Tune	Unknown	Goodspeed Performance Labs	4 programs loaded (91, 93, 100, stock)
12/31/2014	High flow airfilter	Unknown	Goodspeed Performance Labs	Unknown air filter installed. Need to look and see what manufacturer it is.
01/16/2015	Milltek Valvesonic exhaust	Unknown	Goodspeed Performance Labs	Awesome, and custom, setup for exhaust. Lots of details and sound clips on link to left.
01/30/2015	RS6 Grille conversion	Unknown	Goodspeed Performance Labs	Really like the look of the RS6 grille on this car. Crash bar behind bumper was also painted black to complete the look.
02/16/2015	AWE S-Flo Carbon Intake	Unknown	Goodspeed Performance Labs	Looks nice under the hood! Curious what AWE is doing with their v2 as it has apparently been shown there are some performance issues going past Stage 1.
05/19/2015	Milltek Downpipes with test pipes	Unknown	Goodspeed Performance Labs	First go at adding downpipes was without any catalytic converters. Based on fuel smell, custom cats were added a few months later.
05/19/2015	034 Motorsports Transmission Mount insert	Unknown	Goodspeed Performance Labs	Have heard good things about this. Not knowing what it's like stock, I can't really comment.
08/13/2015	High performance 200 cell cats​	Unknown	Goodspeed Performance Labs	Based on fuel smell running just test pipes, owner had custom cats fabricated and installed.

---

Changes under my ownership

Date	Description	Mileage	Shop / Installer	Notes
10/09/2015	Pre-purchase Inspection	31,290	Goodspeed Performance Labs	Included dyno pull, new plugs (one step cooler OEM), and compression test.
10/10/2015	Bought the car!	31,290	NA	Picked it up down in Arizona and drove it back to Seattle with my lovely wife.
10/13/2015	APR TCU Flash	32,890	Achtuning	Even though I'd barely driven it without the TCU flash, I wanted to take advantage of the sale and knew I'd go here in the long run anyways.
11/11/2015	Escort Max 360 Radar Detector	33,420	Self	Not quite as slick as the old V1 install, but very happy with the results.
11/16/2015	Audi rear license plate holder and frame	33,718	Self	Plate holder screws were stripped and I wanted to also go with a lower key license plate frame
11/24/2015	35k mile service	34,360	Audi Bellevue	All standard 35k service items including: oil change, transmission fluid and filter change. Add to this full MMI replacement/upgrade (TSB 2040406/4), all software up to latest revisions (ECU/TCU), thermostat replacement, and replaced motor mounts after finding a failed one.
12/01/2015	H&R 10mm spacers	NA	NA	At first got these for the winter wheels, but now using only for summer as offsets are different and they weren't wide enough for the winters.
12/03/2015	Powdercoated winter wheels	NA	Thermo Tech	Took the OEM 20" wheels I had and got them powder coated by Thermo Tech. Love the look along with the painted center caps. Shop is highly recommended!
12/05/2015	Winter wheels mounted	34,845	Les Schwab	Mounted the newly powder coated OEM 20's with a new set of 255/35R-20 Bridgestone Blizzak LM-32 XL's
12/28/2015	15mm H&R Spacers for winter setup	35,521	Achtuning / Self	The 10mm spacers just weren't wide enough on these wheels. The 15's look great, and don't rub at all.
12/30/2015	Rock chips repaired in windshield	35,654	All-star Auto Glass	Had 2 small nicks that I had filled before they got any bigger.
01/11/2016	ALP Laser Jammer install	36,002	Self	Finally completed the extensive ALP install! Well documented at link on the left.
03/28/2016	APR Stage II Software Update	38,751	Achtuning	Very nice upgrade leading to +20 AWHP and a whopping +82 AWTQ on our 91 octane here. Can definitely feel the difference!
04/11/2016	Eurocode Front & Rear Sway Bars with end links and fitment kit	39,316	Self	A bit of a pain to get the rear installed, but otherwise pretty straightforward. Waiting for test drive today.
11/23/2016	45k mile service	45,205	Audi Bellevue	Changed oil & filter, lubricated wiper pivots and door hinges, replaced brake fluid, replaced faded engine start button. Investigated intermittent seat memory issue, applied 2035357/1. Replaced turbo inlet pipes (TSB 2036167). Replaced coolant pipes and seal ring.
12/19/2016	Replaced driver side seat heater element	45,842	Audi Bellevue	Had failed prior, part came in and it was replaced. I may have messed this one up during stereo install.
5/29/2017	Added 1.5 quarts of oil	51,167	Self	Got the warning it was low and told to add 1.25 quarts. Still some room to spare, so added a total of 1.5. Not sure how great I feel about that (it's been ~6k miles)
09/08/2017	Front Fender Repair	54,147	Queen City Auto Rebuild	My wife accidentally backed into the S6 a while back and we finally decided to get it fixed. Queen City did an awesome job as usual, but we had to get the car re-wrapped because new vinyl on just the fender would have never matched with rest of car.
09/20/2017	Re-wrap	54,299	D&A Customs	After giving the car a week to cure the paint on the front fender, it was time to get her re-wrapped. Went with 3M Brushed Steel and Brushed Black. Read all about it here.
12/22/2018	Broken rear diff mount leading to prop shaft replacement	58,513	Audi Bellevue	This one sucked, see Audi tech's video to the left. Sitting in traffic, I punch it to get into another lane and 'THUNK!'. I thought it was the transmission, but no CEL. Close to the dealer and I drove it there (not the best idea) and it turns out the front bolt that holds the rear diff in place sheered off. As a result, the prop shaft was loose and rubbing on the body and therefore needed to get replaced. It took 5 weeks for Audi to get it in as it was back-ordered from the factory. ...and it wasn't cheap either!
01/30/2018	55k mile service	58,513	Audi Bellevue	While the prop shaft was getting repaired, I also had the dealer do the 55k service. This included: new pollen filter, oil change and new oil filter, lubricated door hinges and sunroof guides. Brakes were at 7mm front and rear, tires (winter) at 8/32.
02/09/2018	Custom mute and LED for Escort Max 360	58,814	Self	The out of the box mute solution for this radar detector always bothered me and I wanted something similar to what I had in my RS4. Read all about it.
02/11/2018	P3cars Multi Gauge	58,927	Self	Had it in the RS4, wanted it in the S6...especially as I head towards more power.​
02/11/2018	OBD2 Splitter	58,927	Self	With the P3cars gauge in place, I wanted to see if I could have both it and the APR dongle attached at the same time. Results are mixed, but it's still a useful mod for me.
02/12/2018	Flat Bottom Steering Wheel	58,954	Self	Jumped on a deal I couldn't resist and love the feel of the thicker wheel.
02/14/2018	Airmatic lowering links installed	58,994	Self	Had these sitting around for 1.5 years before getting around to installing. Loving the final product which also incorporates the VAGCOM lowering I did prior.
02/23/2018	United Motorsport / AMD Stage 2 ECU & TCU Tune	59.156	AMD	BOOM! Is all I can say :) 576 whp and 707 wtq on 92 octane. Good stuff.
02/24/2018	New Battery	59,176	AutoZone	The original finally gave up the ghost. Replaced it with a Duralast Platinum Battery (H8-AGM). It's a little shorter than the stock one.