Speaker system, Bose, 8, dual front door pillar, dual front door mounted, dual rear door mounted, subwoofer, package shelf, center instrument panel, amplifier

Years 2000–07 Models 3 Factory citations 8

Also described as Speaker system 8, dual F/D pillar, dual front door mounted, dual rear door mounted, subwoofer package shelf, I/P center, amplifier, BoseSpeaker system, 8, dual front door pillar, dual front door mounted, dual rear door mounted, subwoofer package shelf, instrument panel center, amplifier, Bose

Also documented for Chevrolet

Documented applications

CTS — Sigma / GMX320 (2003–2007)

2003–2007 Factory-verified

The 2003-2006 lists print "RR DR MD" for the rear door mounting.

GM factory document — 2003 cadillac cts rpo code list, p.1.
GM factory document — 2007 cadillac cts rpo code list, p.1.

DeVille — G-body (2000–2005)

2000–2005 Factory-verified

the 2003–2005 lists print Box where the 2000–2002 lists print Bose.

GM factory document — 2000 cadillac deville rpo code list, p.1.
GM factory document — 2002 cadillac deville rpo code list, p.1.
GM factory document — 2003 cadillac deville rpo code list, p.1.
GM factory document — 2005 cadillac deville rpo code list, p.1.

SRX — Sigma / GMT265 (2004–2009)

2004–2006 Factory-verified

The 2004 and 2005 lists abbreviate the door and amplifier words; the 2006 list spells them out.

GM factory document — 2004 cadillac srx rpo code list, p.1.
GM factory document — 2006 cadillac srx rpo code list, p.1.

This page aggregates every documented appearance of U57 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.