2017 GMC Sierra Denali The rear doors were upgraded with a set of Audiofrog coaxial speakers. The new radio looks incredibly factory, but with many more features. The client was able to retain his backkup camera and parking sensors. The front stage was augmented with Audiofrog 4″ speakers and 1″ tweeters. With the seat folded down the enclosure looks like part of the truck. The front speakers in the doors were upgraded with 3-way Audiofrog speakers. The wiring for the amplifiers was neatly organized and secured for a lifetime of service. All of the amplifiers and crossovers fit behind the rear seat. The battery was upgraded and our fusing and wiring was neatly organized. Our custom subwoofer enclosure provides the client with lots of bass.