An APR-chipped S6 makes the same amount of horsepower with about 100 lb-ft more torque. Though there goes your Audi factory warranty. But it’s a high strung German sports car, so it’s not like reliability is poor or repairs are expensive...

While the engines in the B6/B7 S4 and the B7 RS4 are both 4.2L V8s, they are not the same engine. The RS4 motor includes FSI and a host of other differences.

Doze only works when the phone is off and doesn’t detect any movements at all. So if you leave it off in your pocket for most of the day, you won’t see much, if any, improvement. But the passive battery drain if you were to leave it sitting on the bedstand unplugged overnight should be much lower than before.

Hop into my ‘06 S4 on a Sunday evening to drive home from my girlfriend’s in Chicago. It starts to rain, so I hit the wipers. They go up about one third of the way and then quit. Leave it to Audi to design a wiper transmission linkage that rusts and seizes...

I’d recommend installing Linux instead, should run faster and without as many issues.

A shot DPF but no Check Engine Light? That’s a big no go. Sounds like their OBD systems are nonconforming too.

The 3.0T in the latest Audi S cars has a similar supercharger/intercooler setup. It’s also susceptible to poor cooling circuit bkeeding, especially on the Stage 1/2 cars.

I don’t know light duty, chassis-certification procedures very well, but in heavy duty, engine-certified diesel applications the emission test procedure includes a cold FTP cycle that accounts for 1/7th of the emissions numbers for an engine. And in SCR applications like the MY16 VW engines in question in this…

All certified engines have auxiliary emission control devices. From the regulations: “Any deviation from low altitude emission control practices must be included in the auxiliary emission control device (AECD) descriptions submitted at certification. Any AECD specific to high altitude must require engineering emission…