C7 Corvette Z06 ZR1 Axle-Back Exhaust Sound Guide

By Aftermarket Car Parts -Private Label Mfg | Published: 2026-10-29

Category: Product Reviews

Learn what to expect from a PLM axle-back exhaust on a C7 Corvette Z06 or ZR1. Sound characteristics, installation tips, and common mistakes covered.

Quick answer

A PLM axle-back exhaust on a C7 Corvette Z06 or ZR1 delivers a sporty, aggressive sound with improved throttle response and a modest weight reduction. The 304 stainless steel construction and TIG welding ensure long-term durability.

Sound characteristics and expectations

The PLM axle-back exhaust, also known as a muffler delete or track pipe, replaces the factory mufflers with straight-through pipes. On the LT4 engine in the Z06 and the LT5 in the ZR1, this results in a louder, more aggressive exhaust note, especially under wide-open throttle. Expect a deeper tone with more pronounced crackles and pops on deceleration compared to the stock system.

While the sound is sporty, it is not obnoxious at idle or cruising speeds. The drone level depends on your specific driving conditions and whether you retain the factory active exhaust valves. The PLM system is designed to work with the stock exhaust valves if your Corvette is equipped with them, allowing you to retain some control over volume.

Weight savings and build quality

The PLM axle-back is made from 304 stainless steel with TIG welding, which provides excellent corrosion resistance and a clean appearance. It is lighter than the factory exhaust, contributing to a slight reduction in overall vehicle weight. This is a straightforward way to shed a few pounds from the rear of the car without sacrificing durability.

The system is a direct bolt-on replacement for the factory axle-back section. No cutting or welding is required for installation, making it an accessible upgrade for DIY enthusiasts. The hardware is typically reusable, though replacing the exhaust gaskets is recommended for a leak-free seal.

Performance considerations

The manufacturer claims improved throttle response, horsepower, and torque with this exhaust. While gains are generally modest on a naturally aspirated engine, the reduced backpressure can help the supercharged LT4 and LT5 engines breathe more freely, potentially unlocking a few extra horsepower. The improved gas mileage claim is typically minimal and more a result of the driver's behavior than the exhaust itself.

It is important to note that removing the mufflers will make the car louder, which may not be legal in all areas or acceptable at all tracks. Check local noise regulations before installing a muffler delete system. The sound level increase is significant compared to the factory exhaust.

Installation steps and common mistakes

1. Prepare the vehicle and gather tools: Park on a level surface and let the exhaust cool completely. You will need a jack, jack stands, a 13mm and 15mm socket, a ratchet, penetrating oil, and optionally a pry bar for stubborn rubber hangers. Soak the exhaust hanger bolts and flange nuts with penetrating oil 15 minutes before starting. Do not attempt to work on a hot exhaust system. Burns are a real risk, and the gaskets may be damaged if removed while hot.
2. Remove the factory axle-back section: Jack up the rear of the car and secure it on jack stands. Locate the four bolts connecting the axle-back section to the intermediate pipe. Remove these bolts and the two rubber hangers supporting the mufflers. The factory exhaust may be heavy; have a helper support it as you remove the last hanger. The factory exhaust is heavy and awkward. A second person makes removal much safer and easier. Do not let the exhaust hang unsupported on the hangers.
3. Transfer the exhaust valves (if applicable): If your C7 has active exhaust valves, they are part of the factory axle-back. The PLM exhaust may include provisions to retain them, or you may need to transfer the valve actuators and wiring. Check the included instructions. Some PLM systems are designed for non-valved cars, so verify compatibility before purchase. If you have active exhaust and the PLM system does not support it, you will lose the ability to quiet the exhaust at the push of a button. This is a common oversight.
4. Install the PLM axle-back exhaust: Position the new PLM exhaust on the rubber hangers. Slide the inlet pipes onto the intermediate pipe flanges. Use new exhaust gaskets if provided or recommended. Tighten the four flange bolts evenly to the manufacturer's torque specification (typically around 30-35 ft-lbs). Do not over-tighten as this can warp the flanges. Always use new gaskets. Reusing old gaskets is the most common cause of exhaust leaks at the connection point.
5. Check clearance and final tighten: Before fully tightening, wiggle the exhaust to ensure it is not contacting the underbody, heat shields, or rear bumper. The tips should be centered in the bumper cutouts. Once aligned, tighten all hardware to spec. Recheck after driving a few miles as the system settles. A rattle or vibration after installation is almost always due to the exhaust touching something. Double-check clearance around the spare tire well and the rear fascia.
6. Test for leaks and enjoy the sound: Start the engine and listen for any hissing or ticking sounds at the flange connections. A small soapy water spray can help identify leaks. If you hear a leak, tighten the bolts slightly. Once confirmed leak-free, take the car for a drive to experience the new sound. If the check engine light comes on, it is unlikely related to the exhaust. However, if you disconnected any sensors (like the exhaust valve actuators), ensure they are properly reconnected.

Product details

PLM Axle-Back Exhaust Chevy Corvette 2014-2019 Z06 ZR1 C7: PLM Axle-Back Exhaust Chevy Corvette 2014-2019 Z06 ZR1 C7 is made of 304 stainless steel, TIG welded, lightweight, and produces a sporty sound. The 304 stainless steel with TIG welding ensures the exhaust will resist rust and last the life of the car, while the lightweight design reduces rear unsprung mass.
PLM Axle-Back Exhaust Chevy Corvette 2014-2019 Z06 ZR1 C7