Metra Electronics AXDSPH-GM33 Plug and Play DSP T-Harness for Select 2021-2025 GMC, Chevrolet, and Buick Vehicles (AXDSP-X or AXDSP-L Installation)
We are a Metra Electronics authorized dealer so you get up-to-date, fully warrantied products. Shipping is free to the lower 48 states on everything you order!
What’s Inside?
- •Wiring Harness
- • Owner’s Manual
Seamless DSP T-Harness Upgrade for 2021–2025 GMC, Chevrolet & Buick
Easily upgrade your 2021–2025 GMC, Chevrolet, or Buick with this plug-and-play DSP T-harness. Designed for quick integration, it makes installing the Axxess AXDSP-X or AXDSP-L interfaces (sold separately) simple and hassle-free. Get enhanced audio performance without cutting or modifying your factory wiring.
Wireless Audio Control with Easy DSP Installation
Control your sound like never before with the free AX-DSP-XL app, available for iPhone/iOS and Android. This solution works seamlessly with the AXDSP interface to simplify subwoofer amplifier installation. With true plug-and-play design, you can upgrade your audio system without cutting or modifying factory wiring.








