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Steve M.
I read a few reviews complaining of drone around 2K rpms. Is it possible that it drones with the 2.0 but not so much with the 3.6? Thank you.
Yes, it is highly possible—and actually a very common phenomenon—for the exact same axle-back exhaust system to exhibit a more noticeable or harsher drone on the 2.0L turbocharged engine than on the 3.6L naturally aspirated V6.
While both engines share the same exhaust routing out the back of the Wrangler JL, the difference in drone characteristics around the 2,000 RPM mark comes down to fundamental differences in engine architecture, acoustic frequencies, and how the transmission behaves.
1. Four-Cylinder vs. Six-Cylinder Sound Waves
The 3.6L V6 produces a smoother, higher-frequency exhaust note because it fires six times per two engine revolutions. This creates a more continuous stream of smaller sound pulses that are easier for a standard muffler to damp out.
The 2.0L Turbo, as an inline-four, fires only four times per two revolutions. This creates lower-frequency, higher-amplitude (punchier) sound pulses. Low-frequency sound waves carry more physical energy and are the primary culprit behind cabin "drone"—the resonance that matches the natural vibration frequency of the Jeep's interior panels.
2. Turbocharger Dynamics and Backpressure
A turbocharger acts as a natural muffler right at the exhaust manifold, chopping up sound waves before they hit the downpipe. However, because the turbo creates different backpressure characteristics, it alters the sound frequencies that travel down the line. When you open up the rear section with a high-flow axle-back exhaust, the raw, unrefined four-cylinder acoustic signature becomes much louder.
3. Real-World Driving Behavior at 2,000 RPM
The 2,000 RPM range is a critical spot for both engines, but they handle load differently:
The 2.0L Turbo relies heavily on boost to make its low-end torque. When you are cruising on the highway at 2,000 RPM and hit a slight incline, the engine goes under load and builds boost before deciding to downshift. An engine under boost puts out significantly more exhaust volume and pressure, which exacerbates drone at that exact engine speed.
The 3.6L V6 makes its power more linearly. At 2,000 RPM, it is running purely on naturally aspirated vacuum. If it needs more power to climb a hill, the 8-speed automatic transmission will quickly and smoothly downshift to pull the engine out of that 2,000 RPM danger zone.
What You Can Do
If you are running the 2.0L engine and are sensitive to drone, high-clearance or chambered axle-back systems can sometimes be finicky. If you install the Quadratec Axle Back Exhaust and find the 2K RPM resonance bothersome, adding a small aftermarket resonator loop or a straight-through glasspack style pre-muffler in the mid-pipe section is a popular way to cancel out those specific four-cylinder drone frequencies without sacrificing the upgraded tone.
While both engines share the same exhaust routing out the back of the Wrangler JL, the difference in drone characteristics around the 2,000 RPM mark comes down to fundamental differences in engine architecture, acoustic frequencies, and how the transmission behaves.
1. Four-Cylinder vs. Six-Cylinder Sound Waves
The 3.6L V6 produces a smoother, higher-frequency exhaust note because it fires six times per two engine revolutions. This creates a more continuous stream of smaller sound pulses that are easier for a standard muffler to damp out.
The 2.0L Turbo, as an inline-four, fires only four times per two revolutions. This creates lower-frequency, higher-amplitude (punchier) sound pulses. Low-frequency sound waves carry more physical energy and are the primary culprit behind cabin "drone"—the resonance that matches the natural vibration frequency of the Jeep's interior panels.
2. Turbocharger Dynamics and Backpressure
A turbocharger acts as a natural muffler right at the exhaust manifold, chopping up sound waves before they hit the downpipe. However, because the turbo creates different backpressure characteristics, it alters the sound frequencies that travel down the line. When you open up the rear section with a high-flow axle-back exhaust, the raw, unrefined four-cylinder acoustic signature becomes much louder.
3. Real-World Driving Behavior at 2,000 RPM
The 2,000 RPM range is a critical spot for both engines, but they handle load differently:
The 2.0L Turbo relies heavily on boost to make its low-end torque. When you are cruising on the highway at 2,000 RPM and hit a slight incline, the engine goes under load and builds boost before deciding to downshift. An engine under boost puts out significantly more exhaust volume and pressure, which exacerbates drone at that exact engine speed.
The 3.6L V6 makes its power more linearly. At 2,000 RPM, it is running purely on naturally aspirated vacuum. If it needs more power to climb a hill, the 8-speed automatic transmission will quickly and smoothly downshift to pull the engine out of that 2,000 RPM danger zone.
What You Can Do
If you are running the 2.0L engine and are sensitive to drone, high-clearance or chambered axle-back systems can sometimes be finicky. If you install the Quadratec Axle Back Exhaust and find the 2K RPM resonance bothersome, adding a small aftermarket resonator loop or a straight-through glasspack style pre-muffler in the mid-pipe section is a popular way to cancel out those specific four-cylinder drone frequencies without sacrificing the upgraded tone.
Robert K.
Any fitment issues on a 2023 Willys 4xe with 2.5" Metalcloak True Dual rate lift?
You won't experience any issues installing it on the 4xe platform itself. Just take an extra moment during installation to visually verify clearance between the driver-side pipe and your Metalcloak rear track bar bracket before tightening everything down. You should not experience fitment issues, just double check clearance as you install.
Bill H.
Does it have at least somewhat of a better sound then OEM at idle?
Yes, the Quadratec Axle Back Exhaust provides a significantly deeper and more refined sound at idle compared to the factory (OEM) exhaust.
While the stock Jeep exhaust is often described as "anemic" or overly quiet, this system utilizes a straight-through perforated core with stainless steel mesh wrap. This design allows the engine to produce a noticeable rumble and "purr" at idle without becoming obnoxiously loud or raspy.
While the stock Jeep exhaust is often described as "anemic" or overly quiet, this system utilizes a straight-through perforated core with stainless steel mesh wrap. This design allows the engine to produce a noticeable rumble and "purr" at idle without becoming obnoxiously loud or raspy.
David F.
Is this compatible on Jeep Wrangler JL 3.6 v6 2 door?
Yes, it does.
John M.
What is approximately the hp gain on the 2.0 l turbo?
Switching to a dual exhaust system on your Jeep JL with a 2.0L engine will likely result in a modest horsepower gain, typically in the range of 5 to 10 horsepower at the wheels.
Anthony O.
Would you please clarify whether the two oversized exhaust tips are welded on, or are they clamped on? The product photos show (3) clamps being used, but the video and some customer photos show welded on tips.
The previous design featured welded exhaust tips. This is our latest version that now includes clamp-on tips that can be easily removed on the trail, allowing for quick replacements or the option to swap for different tips.
Scott D.
Will this muffler work with the Quadratec aluminum muffler skid plate?
Yes, it does.
Donald S.
Will this able to be installed with a tow hitch?
Yes, it is compatible with a hitch mounted factory or an aftermarket factory style receiver as well. Thanks for your inquiry.
Thomas S.
Will it work with the 2019 Rubicon Tow package? The Four and Seven pin connector box sits to the left of the hitch. Thanks
Yes, it will fit. Thanks for your inquiry.
Chris W.
Will this fit the 2024 Jeep Wrangler Rubicon 4XE?
It is compatible with 4xe models. Thanks for your inquiry.