GOOD NEWS. K&N HAVE RELEASED THE 57I INDUCTION KIT FOR THE B5 AUDI S4 2.7 BI-TURBO. ITS THE SAME AS FITTED TO THE RS4 BUT HAS NEVER BEEN APPROVED FOR THE S4 UNITL NOW. HOPEFULLY SHOULD GIVE GOOD POWER AND SOUND IMPROVEMENTS. MINE IS ORDERED. 
K&n Induction Kit For S4 2.7 Bi-turbo
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