hey not too many ppl owned 8 series, and even fewer of them did mods ...
soooo, it'll be hard to find a part.
also u said any brand any price, so what exactly are u lookin for?
an oem replacement or an aftermarket noisemaker? improve the
sounds/flow of air/hp ? or just pass inspection?
btw, 850's are REALLY expensive to maintain and work on, let alone mod
oh yeah supersprint sells a system for your car
8-Series (E31)
840/850/Csi (Left)Twin 90mm Round 100% Stainless
840/850/Csi (Right)Twin 90mm Round 100% Stainless