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Best Upgrades for the First Gen Audi 4.0t (S6, S7, RS7, A8, S8)

Alex's Autohaus

The second generation 4.0t, the EA825, has powered the A8 and RS7 since 2019, and more recently, the RS6 Avant, SQ7, SQ8, and RS Q8, as well as some Porsche, Bently, and Lamborghini models. Smaller turbos and less aggressive software from the factory led to a power output of 450 horsepower and 444 lb-ft of torque. Engine Details The 4.0t