Hello
The S4 - 2.7 V6 Bi Turbo has "K03 turbos"
Where as the RS4 has bigger ones - "K04" 's
+ also bigger injectors etc...
hope this helps
David
PS- This is also the same difference between the TT 180bhp (K03) & 225bhp(K04)
(except 1 turbo- obviously)
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