Porsche 997.1 Carrera Exhaust Mufflers & Race Headers

Center X-pipe clarity. Tuned side cans. True PSE valve integration.

The 997.1 Carrera family (3.6/3.8 NA flat-six) is one of the sweetest-revving 911s ever built, but the factory exhaust keeps a lid on its character. The big center canister and conservative cross-over dull throttle response, flatten the midrange, and leave the note a little hollow—more hush than heartbeat. Our Yonristic system replaces the entire center section with a true X-pipe core flanked by tuned high-flow cans, then routes to compact side mufflers that preserve tone while controlling volume. The result is the sound the 997 deserves: cleaner harmonics, fuller midrange, and a hard-edged, motorsport top end—without the droning that plagues straight-through conversions.

Design & Sound (what you see in the photos)

• True Center X-Pipe: Positioned at the pulse-exchange sweet spot, the X equalizes pressure between banks, improving scavenging and sharpening the engine’s attack as revs rise.

• Tuned High-Flow Cans (center): Sized and placed to knock out the 997’s boom frequencies; they smooth the note under cruise while keeping the exhaust path free-flowing.

• Compact Side Mufflers: Unpacked, straight-through internals maintain velocity and give the car a rich, classic 911 timbre at light load with a fierce wail when you lean on it.

• No Drone Tuning: Geometry and can volumes are modeled around cabin resonance zones, so highway cruising stays calm while exterior character remains aggressive.

Valve Control — OEM behavior, plug-and-play

We retain the factory PSE valve locations and actuator mounts; on PSE-equipped cars the behavior is fully preserved. For non-PSE cars, our optional remote valve kit gives you two characters on demand—refined for long trips, or wide-open for back roads.

Materials & Craftsmanship

Built from AISI 304 stainless steel for daily-driven durability (titanium available by request), each system is derived from 3D scans of the 997 underbody for perfect alignment. CNC-machined flanges and brackets lock to factory points, while back-purged TIG welds ensure smooth internal transitions and long life under heat cycling. Mandrel bends keep the cross-section consistent from inlet to tips.

Performance — realistic gains you can feel

On a healthy 997.1, a well-designed X-pipe cat-back typically delivers +8–12 whp and +8–12 lb-ft with noticeably crisper throttle response. Pairing our system with 200-cell sport cats and a quality ECU calibration commonly lifts total improvements into the +15–25 whp range, with a broader, cleaner pull to redline. The headline, however, is tone quality and weight: deleting the bulky center canister drops mass and replaces the muted stock voice with a sharp, classic flat-six cry.

Fitment & Options

• Models: 997.1 Carrera / Carrera S / Carrera 4S (and GTS applications supported—confirm valve/connector style at order).

• Tips: Quad outlets in polished, satin black, burnt, or carbon finishes.

• Installation: 100% bolt-on, reversible; uses factory mounting points; no cutting or welding.

• Compatibility: Works with OE manifolds or aftermarket headers/sport cats.