No matter the condition of your 2004 CTS, OPGI has the Engine Assemblies products you need to boost performance and get you back on the road. We currently carry eleven Engine Assemblies items to choose from for your 2004 CTS, and our Price Match Guaranteed prices range from as little as $10,949.99 up to $27,749.99. OPGI offers Blueprint Engines plus zero other trusted brands of Engine Assemblies products for your 2004 CTS, to help you find quality parts you can rely on. With OPGI's 45-day return policy, you can shop with the utmost confidence. Enjoy parts delivered directly to your home, or visit our sunny Southern California Showroom & Warehouse to check out our Engine Assemblies items in person.