Comparing the design and output of the German twin turbo V8's stock and tuned - BMW M S63TU vs. AMG M157 vs. Audi RS6/RS7 4.0 TFSI V8 vs. Porsche 4.8

[Sticky]

@Sticky just randomly came across jerry from eurocharged page on instagram and saw some of these graphs. The RS7 has downpipes so its not an apples to apples comparison. They have another m157 on his page that had downpipes in addition to the tune and put down 646whp and 755wtq also on the same dyno

The RS7 was presented to me as tune only.