The stock sound system in my 2003 Mini Cooper S suddenly stopped emitting sound. I took it to Tri-state b/c they did a good job on the sound system in my 2004 Toyota 4Runner last year. Following their assessment, they offered to install a new amplifier for $450 or an entire new system for $1100. I went for the amp. After the install I see what they did and it was simply a plug & play replacement. Sure, they had to re-mount the new amp (new drilled holes, etc), but jeez $450! If I knew this, I would have done it myself.