When it launches later this year, GMC’s all-new 2019 Sierra will offer a performance axle-back exhaust system from the factory. Here’s the low-down on the axle-back kit.
The optional performance exhaust for the 2019 Sierra features 4-inch stainless steel tubing with an in-line muffler and round tip. GMC claims that the system “reduces restrictions in the exhaust pipes and expands the diameter of stock pipes, allowing your engine to breathe better.” The exhaust tip features an imprinted GMC logo.
Assigned RPO code WBC, the cat-back exhaust is technically a Limited Production Option (LPO) feature – which means that it can be optioned on the vehicle during the order process and installed at the factory or shipped to the dealer as an official GM (GMC) accessory and then either sold to the customer or installed by the dealer on an in-stock vehicle. To get the system in the 2019 GMC Sierra, it must be equipped with either the 5.3L V8 L84 or 6.2L V8 L87 Gen 2 EcoTec3 engines. As such, the system can’t be optioned with the 4.3L LV3 V6, 2.7L L3B I4 Turbo, or the 3.0L Duramax I6 turbo-diesel.
It’s worth mentioning that the 2019 Sierra also offers an optional polished exhaust tip that is assigned RPO Code VQZ, but this particular tip cannot be optioned with the WBC performance exhaust, likely because it has a bigger outlet than the stock unit, fo which the standard tip is designed.
The system is available for both, the 2019 Sierra with the single exhaust as well as models with the built-in dual exhaust, which is new for the 2019 model year.
The price for this 2019 Sierra exhaust from GM is $1,195 for single-exhaust models or $1,595 for dual-exhaust models, which is comparable to an aftermarket axle-back system from Corsa, Borla and the like. Installation is (obviously) included when the system is ordered with the vehicle (since it is installed at the factory). In this case, the system is covered by the bumper-to-bumper warranty.
Those opting to buy the system after the fact as an accessory will likely need to pay extra for installation. In this case, the system is covered under the “greater of either the balance of the vehicle’s bumper-to-bumper warranty or 12 months / 12,000 miles.”
Since the 2019 Sierra has yet to launch or arrive on dealer lots, a video of the 2019 GMC Sierra equipped with the optional exhaust simply doesn’t exist. However, we did come across the below video that provides a quick overview of the installation process of a cat-back exhaust system on the last-generation (K2 platform) 2014 GMC Sierra Denali 1500 equipped with the 5.3L V8 L83 engine, which is part of the Gen 1 EcoTec3 engine family. Though the 2019 Sierra features upgraded engines (the L84 and L87) that are part of the Gen 2 EcoTec3 family, the sampling at the end of this video should give us a pretty good idea of what a free (or free-er) flowing exhaust setup on the 5.3 V8 engine will sound like.
Hopefully we’ll be able to hear the real deal for ourselves in the near future.