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RS4's drop a lot of power due to Carbon build up. That's well documented due to Di.
I had my intakes walnut blasted at 66k the build up was bad but not as bad as pics I have seen for 335i.
I had the injectors done after that on warranty. Car now runs very well. That's not to say it ran that bad before. Most noticeable sign of poor running was a black exhaust pipe & slight fluctuation on idle. Showing the car was running very rich. Post the work I can now drive a couple of hundred miles with no build up. Before that it was 2-3 miles.
So have a look at your pipe & maybe spark plugs.... old school way to decide how well your engine is running.
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