There’s a reason exhaust systems remain one of the most rewarding modifications enthusiasts make.

Power matters. Styling matters. But sound changes the way a car feels every single time you drive it.

Whether it’s the deep turbocharged growl of BMW’s B58 inline-six or the unmistakable high-revving character of Porsche’s naturally aspirated flat-six, the right exhaust system turns an already great car into something far more memorable.

Now available at XPH, the Valvetronic Valved Sport Exhaust lineup for the BMW G29 Z4 M40i and Porsche 911 Carrera / S / GTS (991.1) gives drivers complete control over their driving experience—delivering aggressive performance sound when you want it and refined cruising when you don’t.

BMW G29 Z4 M40i Valved Sport Exhaust System

The B58 Has More to Say

BMW’s B58 has become one of the most celebrated turbocharged six-cylinder engines of the modern era.

Smooth power delivery, excellent tuning potential, and a broad torque curve have made it a favorite among enthusiasts. But while the engine delivers impressive performance from the factory, many owners feel the stock exhaust leaves some of its personality hidden.

The Valvetronic G29 Z4 M40i Exhaust was developed to unlock more of the B58’s character while preserving the refinement expected from a premium roadster.

Full Control at the Push of a Button

The defining feature of this system is flexibility.

Using electronically controlled valves and an included controller kit, drivers can instantly switch exhaust behavior depending on the situation.

Valves Open

Open the system and the Z4 transforms.

The exhaust becomes deeper, more aggressive, and more connected to throttle input while allowing additional turbo sound and overrun characteristics to come through.

Valves Closed

Close the valves and the system settles into a refined cruising mode designed for everyday use.

Quiet starts, highway comfort, and low-drama commuting remain fully intact.

Engineered for Flow and Sound

Performance wasn’t treated as an afterthought.

The system utilizes:

• Large 3.5-inch central exhaust section
• Dual 3-inch mandrel-bent pathways
• Optimized exhaust scavenging
• Reduced backpressure
• Lightweight construction approximately 11.1 lbs lighter than OEM
• Precision TIG-welded T304 stainless steel

Finished with brushed Valvetronic tips, the rear of the Z4 gains visual presence to match its improved soundtrack.

Compatible with:

• 2017–2026 BMW Z4 M40i (G29)

Porsche 911 Carrera / S / GTS (991.1) Valved Sport Exhaust System

Let the Flat-Six Sound Like It Should

Few engines are as recognizable as Porsche’s flat-six.

The 991.1 generation already delivers one of the best driving experiences in the sports car world, but enthusiasts know that exhaust tuning can completely transform the emotional side of ownership.

The Valvetronic Exhaust for the 991.1 was engineered specifically to enhance the natural voice of the engine—not replace it.

X-Pipe Engineering for Signature Porsche Character

At the center of this system is a large performance X-pipe configuration.

By improving exhaust scavenging and smoothing gas flow, the system amplifies the sharp, rising character that makes naturally aspirated Porsche engines so addictive.

With valves open, the result is a sharper, motorsport-inspired sound profile that highlights every climb toward redline.

With valves closed, refinement returns for longer drives and everyday usability.

Lightweight Performance with Everyday Comfort

Like the BMW system, this exhaust focuses on delivering excitement without introducing unnecessary compromises.

Highlights include:

• Vacuum-actuated valved exhaust system
• Available in Anodized Gold T304 stainless steel
• Available in Blue burnt titanium finish
• Approximately 21.8 lbs lighter than factory (T304 version)
• Fully mandrel-bent piping
• Precision TIG-welded construction
• Fully reversible installation

Fitment includes:

• 2012–2016 Porsche 911 Carrera
• 2012–2016 Porsche 911 Carrera S
• 2012–2016 Porsche 911 Carrera GTS
• 2014–2016 Porsche 911 Targa 4 / 4S / GTS
• Coupe and convertible models

One Philosophy: Sound When You Want It

Despite being completely different cars, both systems follow the same idea:

Performance should adapt to the driver.

Quiet when needed.

Aggressive when desired.

Comfortable on the commute.

Exciting when the road opens up.

That balance is exactly what makes valved exhaust systems some of the most satisfying upgrades available.

Available Now at XPH

Whether you want to wake up your BMW Z4 M40i or unleash the signature soundtrack of your Porsche 911, Valvetronic delivers a premium solution built around performance, sound quality, and everyday usability.

Shop both systems today at XPH:

BMW G29 Z4 M40i Valved Sport Exhaust System: https://x-ph.com/valvetronic-bmw-g29-z4-m40i-valved-sport-exhaust-system/

Porsche 911 Carrera / S / GTS (991.1) Valved Sport Exhaust System: https://x-ph.com/valvetronic-valved-sport-exhaust-system-for-porsche-911-carrera-s-gts-991-1-fdqe/