Before you read below, perhaps check out this cool new video by our friends at Racing for ALS who bolted one on their Camaro ZL1 1LE before a track weekend at VIR. Video can be found HERE.
By popular demand, Griffin Motorsports delivers another simple solution to a common aftermarket problem… The rear bumper parachute effect. Although the GMS Rear Bumper Belly Pan is hidden once installed, the benefits will not be!
Question: So, who needs one?
Answer: Everyone who has removed the OEM suitcase muffler and installed just about any of the awesome aftermarket axle-back muffler packages available to the 6th Generation Camaro.
Why: Well, for those of us who have replaced the factory “suitcase” muffler with a cat-back / axle-back of choice for better sound and a weight reduction, there was a hidden and unfortunate tradeoff.
As ugly and heavy as the OEM suitcase muffler was, it did contribute to the cars overall aero effectiveness by providing a gentle airflow path from the rear differential past the bumper without allowing the air to get trapped within the large bumper cavity.
Which is exactly what’s revealed when the OEM muffler is removed and replaced with most of the aftermarket muffler options. (it’s ok if you missed it, we were also too busy staring at the new shiny exhaust tips)
The issue here is the parachute effect that is created by the large bumper cavity after the muffler is removed. An issue that ALL OEM’s and aftermarket aero designers for all automotive makes / models work hard to prevent. The reason?
1. Aerodynamic Drag
If the rear bumper has an open area, especially one that acts like a scoop or cavity, it can trap air as the car moves at any speeds.
This creates turbulence and increased drag — meaning your car is pushing against more air resistance than it prefers, which can provide unwanted resistance and reduced fuel efficiency.
2. Lift at the Rear
That trapped air can create positive pressure in the bumper area.
Since cars are designed to reduce lift (especially at high speed), this pressure buildup can provide unwanted lift, which could reduce traction.
3. Rear-End Stability
That kind of trapped air can lead to instability as the airflow becomes unpredictable, which can cause little wiggles or even sway in high-speed turns.
This is particularly noticeable in cars that rely on aero or have diffusers as the disruption in airflow may disturb the cars ability to stay planted.
Clearly our solution is NOT new within the motorsports community, but it is new for the 6th Generation Camaro. Manufactured from lightweight but strong 5052 H32 x .080” thick aluminum the GMS Rear Bumper Belly Pan installs in minutes using all OEM mounting points with no drilling required, and best of all, you don’t even need lift! The belly pan is delivered with the added protection of a durable black powder coat with satin wrinkle finish to protect against wear and tear, and help your undercarriage look OEM or better for all who have a chance to see it. We also thought ahead and provided a laser cut custom rubber gasket to protect the mating surface between the Bottom of your bumper and the belly pan. We also provide two custom foam gaskets for the mating surface between the upper mounts and the undercarriage heat shield.
WARNING; Preliminary testing results have already shown a 1-2 MPG increase in fuel economy and faster lap times, which may increase overall happiness. Although anecdotal, it is a start, with more testing being conducted now. Stay tuned for more!
FITMENT: Although the variants below are separated by muffler brand and designed to contour close to your muffler design, please be aware that not all muffler installations are alike. Your fitment results may vary depending on exactly how your installer did. Some adjustments to muffler location may be needed. We observed this even within our production design and testing where many cars mufflers sit in different locations and are rotated differently. So much in fact that we are unable to adjust for this. We need to make these symmetrical, and aim to fit snug to prevent large air gaps. Your mufflers may need to be adjusted for the best looking fit. You have been warned! Also note, that the ZL1’s have three homes in the bumper where the SS only have two. All of our belly pans are design to fit both, and will come with the 3rd hole. For SS users, either upgrade to a ZL1 (I know you want to) or consider this extra hole a small weight reduction and an advantage over the rest of us!
BUNDLE DISCOUNT OPTION: What better way to enjoy the reduced drag gained by your new GMS Rear Bumper Belly Pan, then pairing it with the added heat extraction of our GMS Hood Bracket… We pass the savings of combining on the same order + more to save you a total of $33.50 when you use discount code BELLY-PAN-BUNDLE.
HIDDEN DISCOUNT - Use Discount Code EASTER-EGG-1 for $25 off of THIS NEW GMS product.
Whats in the box;
(1) GMS Rear Bumper Belly Pan with a black wrinkle finish.
(2) Foam Spacers and a rubber gasket at bumper connection.
Fitment; 2016 - 2024 Chevy Camaro (all models)
Before you read below, perhaps check out this cool new video by our friends at Racing for ALS who bolted one on their Camaro ZL1 1LE before a track weekend at VIR. Video can be found HERE.
By popular demand, Griffin Motorsports delivers another simple solution to a common aftermarket problem… The rear bumper parachute effect. Although the GMS Rear Bumper Belly Pan is hidden once installed, the benefits will not be!
Question: So, who needs one?
Answer: Everyone who has removed the OEM suitcase muffler and installed just about any of the awesome aftermarket axle-back muffler packages available to the 6th Generation Camaro.
Why: Well, for those of us who have replaced the factory “suitcase” muffler with a cat-back / axle-back of choice for better sound and a weight reduction, there was a hidden and unfortunate tradeoff.
As ugly and heavy as the OEM suitcase muffler was, it did contribute to the cars overall aero effectiveness by providing a gentle airflow path from the rear differential past the bumper without allowing the air to get trapped within the large bumper cavity.
Which is exactly what’s revealed when the OEM muffler is removed and replaced with most of the aftermarket muffler options. (it’s ok if you missed it, we were also too busy staring at the new shiny exhaust tips)
The issue here is the parachute effect that is created by the large bumper cavity after the muffler is removed. An issue that ALL OEM’s and aftermarket aero designers for all automotive makes / models work hard to prevent. The reason?
1. Aerodynamic Drag
If the rear bumper has an open area, especially one that acts like a scoop or cavity, it can trap air as the car moves at any speeds.
This creates turbulence and increased drag — meaning your car is pushing against more air resistance than it prefers, which can provide unwanted resistance and reduced fuel efficiency.
2. Lift at the Rear
That trapped air can create positive pressure in the bumper area.
Since cars are designed to reduce lift (especially at high speed), this pressure buildup can provide unwanted lift, which could reduce traction.
3. Rear-End Stability
That kind of trapped air can lead to instability as the airflow becomes unpredictable, which can cause little wiggles or even sway in high-speed turns.
This is particularly noticeable in cars that rely on aero or have diffusers as the disruption in airflow may disturb the cars ability to stay planted.
Clearly our solution is NOT new within the motorsports community, but it is new for the 6th Generation Camaro. Manufactured from lightweight but strong 5052 H32 x .080” thick aluminum the GMS Rear Bumper Belly Pan installs in minutes using all OEM mounting points with no drilling required, and best of all, you don’t even need lift! The belly pan is delivered with the added protection of a durable black powder coat with satin wrinkle finish to protect against wear and tear, and help your undercarriage look OEM or better for all who have a chance to see it. We also thought ahead and provided a laser cut custom rubber gasket to protect the mating surface between the Bottom of your bumper and the belly pan. We also provide two custom foam gaskets for the mating surface between the upper mounts and the undercarriage heat shield.
WARNING; Preliminary testing results have already shown a 1-2 MPG increase in fuel economy and faster lap times, which may increase overall happiness. Although anecdotal, it is a start, with more testing being conducted now. Stay tuned for more!
FITMENT: Although the variants below are separated by muffler brand and designed to contour close to your muffler design, please be aware that not all muffler installations are alike. Your fitment results may vary depending on exactly how your installer did. Some adjustments to muffler location may be needed. We observed this even within our production design and testing where many cars mufflers sit in different locations and are rotated differently. So much in fact that we are unable to adjust for this. We need to make these symmetrical, and aim to fit snug to prevent large air gaps. Your mufflers may need to be adjusted for the best looking fit. You have been warned! Also note, that the ZL1’s have three homes in the bumper where the SS only have two. All of our belly pans are design to fit both, and will come with the 3rd hole. For SS users, either upgrade to a ZL1 (I know you want to) or consider this extra hole a small weight reduction and an advantage over the rest of us!
BUNDLE DISCOUNT OPTION: What better way to enjoy the reduced drag gained by your new GMS Rear Bumper Belly Pan, then pairing it with the added heat extraction of our GMS Hood Bracket… We pass the savings of combining on the same order + more to save you a total of $33.50 when you use discount code BELLY-PAN-BUNDLE.
HIDDEN DISCOUNT - Use Discount Code EASTER-EGG-1 for $25 off of THIS NEW GMS product.
Whats in the box;
(1) GMS Rear Bumper Belly Pan with a black wrinkle finish.
(2) Foam Spacers and a rubber gasket at bumper connection.
Fitment; 2016 - 2024 Chevy Camaro (all models)
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