Skip to content
Toggle mobile menu
- On all orders! -
Call Us: (385) 489-7479
SCRATCH AND DENT
Choose Your Vehicle
Nav Menu 5
Nav Menu 6
Nav Menu 7
Nav Menu 8
GMG Racing WC-Sport Headers
The 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. Utilizing 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 its 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 its 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 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. It will fit both 991.1 and 991.2 generations.
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
Meticulously TIG welded to exceptional strength and durability
Lightweight: 12lbs vs 18lbs OEM
Designed to work with factory turbochargers
Fabricated right here in Southern California
Soul Performance Porsche GT4 / Boxster Spyder Competition Headers
Soul Performance Porsche 987.1 Boxster / Cayman Competition Headers
Agency Power Headers Porsche 996TT 01-05 | 997TT 07-09
Soul Performance Porsche 981 Boxster / Cayman Competition Headers
GMG Racing Long Tube Headers 991 GT3/GT3RS
Soul Performance Porsche 981 Boxster / Cayman Long Tube Street Headers
Soul Performance Porsche 991.1 Carrera Competition Headers
Agency Power Header and Section 1 Mid Pipes Mercedes-Benz C63 AMG 08-11
Share your knowledge of this product.
Be the first to write a review »