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GMG has transformed another new Porsche 991 Turbo S into a well-rounded supercar with our engine and suspension performance upgrades. With the proven combination of our best-selling exhaust, headers, and GIAC software upgrade, we helped improved the anemic factory exhaust note and overall engine performance. We complemented the engine upgrades with our GMG lowering springs. The result is improved vehicle handling and aesthetics with a slightly more aggressive stance while maintaining a subtle factory appearance.

Stock Ride Height







Stock Exhaust vs GMG Sport Exhaust





GMG Lowering Springs Installed





With GMG Sport Lowering Springs and Exhaust Installed







GMG Porsche 991 Turbo Exhaust











The GMG Porsche 991 Turbo exhaust system increases overall performance, enhances the sound, and reduces weight. Handcrafted out of T304 Stainless steel and meticulously TIG welded to aerospace specifications with great precision, the system is lighter than the factory system and displays a level of quality that is unsurpassed. Weighing 37 pounds, the GMG exhaust system is 20 percent lighter than the factory system.

The system features German made 200 cell sport catalysts that are OBD2 compliant with proper 02 sensor placement to ensure no CEL (Check Engine Light) and a crossover x-pipe to increase power by balancing exhaust gas pulse coming from the engine and adds to the signature sound that only the GMG system can offer.

The crossover x-pipe works by balancing the exhaust pulses from either side — or cylinder bank – of the engine. It allows the exhaust to flow down the path of least resistance while speeding up exhaust velocity. At lower revs, turbulence is formed as exhaust gases try to shuffle past a second column of gases coming from the other side. While always producing more power than the restrictive factory system, exhaust speed is increased as the engine revs increase. The X-Pipe merges the exhaust into two uniform streams, allowing a smooth flow from engine to exhaust exit.

Stainless steel packing is used our mufflers to withstand extreme exhaust temperatures and high intensity acoustic pressures that are generated by the turbo system that is located within very close proximity. This is one of the key advantages of the GMG exhaust system since most other exhaust systems uses fiberglass packing instead to lower costs, and they are prone to rapid deterioration. The exhaust system is a direct bolt on replacement for the factory system and includes all necessary hardware.

Features:

- Horsepower and torque increased up to 30hp without software upgrade

- Deep aggressive exhaust notes at lowers revs & exotic high pitched exhaust notes at higher revs

- No unwanted cabin drone

- Constructed out of US Made T304 stainless steel

- Hand built in the USA

- Meticulously TIG welded throughout to aerospace specifications

- Each system is individually serialized with laser etched badge

- Signature Brushed Finish and Quad tip design

- Significant weight savings over the stock system

- System Weight: 37 pounds- Propriety Crossover center section with X pipe design

- OBD2 compliant German made 200 cell sport catalysts

- No CEL (Check Engine Light)

- Stainless steel muffler packing

- Direct bolt on replacement with all hardware and clamps included

GMG Porsche 991 321 Stainless Headers


















The latest GMG Porsche 991 Turbo exhaust manifold system is handcrafted from the highest grade 321 stainless steel and features equal length tubing and large 3 into 1 merge collectors.

The GMG system is designed to reduce exhaust back pressure and complements the 991 Turbo's capabilities with improved throttle response and an increase in power and torque output. Untilizing equal length tubing and large 3 into 1 merge collectors, smoother flow of exhaust gases is achieved.

GMG chose 321 stainless steel to build the 991 Turbo headers due it's improved heat management properties over 304 stainless steel. For many high performance turbo applications, exhaust gas temperatures (EGT) can exceed 1400° F which is beyond the working temperatures of mild and 304 stainless steel. Because of it's excellent resistance to fatigue and cracking at elevated temperatures, 321 stainless steel tubing is one of the most desirable materials for exhaust systems.

Stabilized with titanium, 321 is an excellent choice for most turbo applications due to the increased material strength at high temperatures. To prevent premature cracking or warping, the GMG manifolds utilize laser cut flanges and each side of the turbo flanges are meticulously TIG welded. Proper welding technique is very critical for turbo headers due to the high stresses they see when in use.

To reduce heat and to direct more exhaust energy to the turbochargers, thicker stainless tubing is used versus standard thin wall stainless. 321 stainless conducts less heat than mild steel, helping to reduce heat and to direct more exhaust energy to the turbos.

The GMG Porsche 991 Turbo exhaust manifold system is designed to work with the factory turbochargers as a bolt-on replacement.























Features

- Large primary runner with a 3 into 1 collector
- Improve throttle response and reduce turbo lag
- Increase horsepower and torque output
- Smoother flow of exhaust gases into turbocharger
- Reduced temperature
- Laser cut flanges to ensure no warping
- Meticulously TIG welded to exceptional strength and durability
- Lightweight: 12lbs vs 18lbs OEM
- Designed to work with factory turbochargers
- Handcrafted in the USA

GMG Porsche 991 Turbo Lowering Springs
Improve Handling Without Compromising Comfort
Made by Eibach Exclusively to GMG's Specifications



The GMG WC lowering spring kit improves the vehicle's performance, handling, and appearance. The kit features an increased spring rate and drops the vehicle by 1.1" to lower the center of gravity of the vehicle to improve handling - reducing squat during acceleration, body roll in corners, and excessive nose-dive under braking - and to reduce fender gap to give the vehicle a lower, more aggressive stance.

The GMG WC lowering spring kit utilizes a proprietary progressive spring design to maintain excellent ride quality. The progressive rate design uses a softer initial spring rate for excellent ride quality and a stiffer final rate for high performance handling. The spring rate increases when the vehicle is under load during cornering, braking, or load carrying etc.

Crafted from highest quality high-tensile steel tubing , the springs will not set or sag over time. The GMG WC lowering spring kit is designed and manufactured by Eibach exclusively for GMG. Through the partnership, GMG developed lowering spring kits for high performance street applications using the data and knowledge gained over the years from professional racing in the ALMS and Pirelli World Challenge Series.

The GMG WC lowering spring kit is sold as a complete set and is designed to use with the factory PASM dampers. The spring rates are proprietary to GMG and they are specifically matched to the factory dampers so that the vehicle won't be over-sprung and under-dampened. The 4-Wheel steering is system is not affected with OEM wheels & tires, as well as most 21" sizing, but contacting GMG is highly recommended for aftermarket wheel sizes.

As a great alternative to much more expensive and more complicated coil over systems, the GMG lowering spring kit is an excellent set up for enthusiasts who would like to lower their car and improve handling without compromising comfort.

Key Features

- Drops the vehicle by 1.1" to lower the center of gravity
- Improves handling - reducing squat during acceleration, body roll in corners, and excessive nose-dive under braking
- Reduce fender gap to give the vehicle a lower, more aggressive stance
- Progressive spring design for excellent ride quality
- Smooth softer initial spring rate for excellent ride quality and stiffer final rate for high performane handling
- Manufactured by Eibach to proprietary GMG specifications
- Made of the highest quality high-tensile steel tubing to ensure consistent spring rates and no sagging
- Factory 4-Wheel steering is system is not affected with OEM wheels & tires

GMG products are also available worldwide through our growing dealer network in North America, Latin America, Europe, Middle East, Africa, Asia and Pacific: http://www.gmgracing.com/dealers/

International Shipping is Available and Wholesale Inquiries are Welcomed

For all questions, inquiries, or to place an order, please email Dom@GMGRacing.com or Sales@GMGRacing.com

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