AC Schnitzer has released videos of its various exhaust systems for the F10 550i, Z4 sDrive35is, X6M, 135i, 335i, M3, including comparisons to the BMW factory exhaust.
F10 550i (factory)
F10 550i (AC Schnitzer)
M3 (factory)
M3 (AC Schnitzer homologated)
M3 (AC Schnitzer export version)
335i (factory)
335i (AC Schnitzer homologated)
335i (AC Schnitzer export version)
Z4 sDrive35is (factory)
Z4 sDrive35is (AC Schnitzer homologated)
Z4 sDrive35is (AC Schnitzer Export Version)
X6M (factory)
X6M Falcon (AC Schnitzer homolated)
X6M Falcon (AC Schnitzer export version)
X6M Falcon (AC Schnitzer export version 650PS)
135i (factory)
135i (AC Schnitzer export version)