SOUL Performance Valved Side Mufflers for 996 Porsche 911 Carrera 4S

SOUL Performance Products’ Porsche 996 Carrera 4S Valved Side Mufflers deliver a true two-mode experience – quiet and refined with the valves closed, then Cup car-inspired and aggressive at the press of a button with the valves open. Designed to pair cleanly with other upgrades (including aftermarket catalytic converter replacements), the system uses drone-fighting mufflers to minimize unwanted cabin resonance while keeping the sound transformational when you want it. This configuration is selected with Polished tips and is fully compatible with the factory valve controls, while also cutting weight by 14.5lb / 6.5kg compared to the factory PSE exhaust (35.4lb vs 49.9lb). Built in-house at SOUL Performance Products Willow Grove, PA facility from mandrel-bent T304L stainless tubing with bespoke SOUL mufflers and laser-cut brackets, each set is fixture-tested, quality-checked, and foam packed before shipping, and backed by a Lifetime Warranty for street and track use.

Development

• SOUL Performance’s goal was to deliver a premium muffler upgrade with two distinct modes – an exciting, aggressive character when desired, and a calm cabin presence for commuting with the valves closed. At the press of a button, SOUL Performance Valved Side Mufflers open to deliver Cup car-inspired sound through a free-flowing design that can be further amplified with aftermarket catalytic converter replacements. With the valves closed, SOUL Performance’s drone-fighting mufflers help minimize unwanted cabin resonance even when paired with other aftermarket components, resulting in an OEM-plus sound with true transformational potential.

Construction

• Each system is made in-house by SOUL Performance’s fabrication team using mandrel-bent 0.060-inch wall T304L stainless steel tubing, bespoke SOUL mufflers, and laser-cut brackets, with nearly 15 labor hours invested in every set to ensure it meets SOUL Performance standards.

Bolt on and Go

• Each exhaust is built and fixture-tested by SOUL Performance using a thick-gauge aluminum jig to help prevent warping and confirm precise fitment. Every set is rigorously quality-checked prior to shipping and then foam packed to help ensure it arrives in perfect condition. New high-grade bolts, washers, and nuts are included.

Features

• Two-mode valved design – quiet with valves closed, aggressive when open
• Cup car-inspired tone on demand with drone-fighting refinement for cruising
• Polished tips and full compatibility with factory valve controls
• Works well with aftermarket catalytic converter replacements
• Weight savings vs OEM PSE: 35.4lb vs 49.9lb (saves 14.5lb / 6.5kg)
• In-house build: mandrel-bent T304L stainless, bespoke mufflers, laser-cut brackets
• Fixture-tested, quality-checked, foam packed – includes new hardware
• Built in-house in Willow Grove, PA with SOUL Performance Lifetime Warranty

Applications

• Porsche 911 Carrera 4S: 996 | 1999-2004 | 3.4L F6, 3.6L F6

About SOUL Performance

SOUL Performance Products was founded by a group of automotive enthusiasts with deep industry experience and a commitment to doing right by their customers. Their mission is to deliver outstanding performance parts at fair pricing, backed by quality service and one of the best warranties in the industry. SOUL develops high-performance exhaust systems and components that are engineered for exceptional sound and proven performance, with products ready to ship quickly worldwide. Guided by core values of honesty, transparency, and passion for cars, they build strong community connections and prioritize customer satisfaction at every step. Operating out of a dedicated facility in Willow Grove, Pennsylvania, SOUL combines hands-on research, engineering, and manufacturing expertise to create parts that meet and exceed the demands of serious enthusiasts.