i think the only biturbos audi makes is the S4 and TT
The A8 diesel is technically a biturbo, with two turbos, as is the TDI engine on the Phaeton and Toureg (5.0L V10). In fact, any V8, V10, or V12 Audi TDI engine has two turbos. Also, the newer S and RS4 are NA V8s
Biturbo is each engine of the TT Bimoto which produces totally 860hp. The TT rocket!!!!
TT has never had a biturbo. In addition to the 2.7T biturbo in the B5 S4 (and C5 A6 and C5 allroad), the C5 RS6 had a 4.2L biturbo.
The A6 also used the 2.7l twin turbo. Same engine as the B5 S4.
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