Porsche 981 Cayman / Boxster Performance Cat-Back Exhaust System

(Cayman / Boxster / Cayman S / Boxster S / GTS)

Unlock the true character of the Porsche 981 with a completely redesigned exhaust system engineered to maximize flow, sharpen throttle response, and unleash the flat-six soundtrack the factory system hides. The OEM exhaust on the 981 is heavily baffled to meet comfort and noise regulations—resulting in a muted, restricted tone that fails to showcase the engine’s natural resonance. Our system transforms the car into the raw, motorsport-inspired machine it was meant to be.

At the heart of this design is a dual-loop architecture constructed from 2.5-inch (63mm) mandrel-bent tubing, engineered to amplify exhaust pulse length while smoothing out the frequency balance. The loops deepen the midrange growl while sharpening the top-end scream, creating a uniquely exotic tone that no conventional system can reproduce. Exhaust flow then merges through our hand-built X-pipe exit, which equalizes bank pressures and blends pulses into a clean, razor-sharp flat-six wail.

This is a pure, valveless straight-through system—built for drivers seeking the full acoustic and performance potential of the 981 platform. Without internal restrictions or valve bottlenecks, the engine breathes freely, improving responsiveness and supporting additional tuning, high-flow headers, or upgraded intakes. During installation, simply sealing the factory vacuum valve lines ensures a proper ECU response and prevents any CEL issues.

Every system is hand-welded, hand-built, and available in either AISI 304 stainless steel or 6AL-4V aerospace-grade titanium for maximum weight savings and a more vivid, higher-frequency tone. The setup finishes with aggressive 3.5-inch exhaust tips, available in polished chrome, satin black, burnt, or forged carbon fiber to match your vehicle’s aesthetic.

Completely bolt-on with no cutting or welding required, this exhaust offers the perfect balance of craftsmanship, sound, and performance for any 981 enthusiast looking to elevate their driving experience.

Key Specifications

Fitment:
Porsche 981 Cayman / Boxster / Cayman S / Boxster S / GTS (2013–2016)

Configuration:
Dual-loop cat-back system
2.5" (63mm) mandrel-bent tubing
Merged X-pipe exit
No valves — straight-through performance design

Materials:
AISI 304 Stainless Steel
6AL-4V Titanium (55–60% lighter than OEM)

Manufacturing:
Full 3D-scanned fitment
TIG-welded by hand
Precision-formed loops and X-pipe
Show-grade finish

Tip Options (3.5” diameter):
Chrome / Burnt / Satin Black / Forged Carbon Fiber

Performance Gains:
+8–12 hp & +10–14 lb-ft (cat-back only)
+18–25 hp with high-flow headers (estimated based on 981 tuning data)
Improved throttle response & faster revving
More efficient exhaust scavenging due to X-pipe merge

Weight Savings:
304 Stainless: ~5–8 lbs lighter than OEM
Titanium: ~15–20 lbs lighter than OEM

Installation:
100% bolt-on; no cutting or welding needed
Recommendation: cap/seal OEM vacuum valve lines to avoid CEL
Direct fit with OEM mounting points

Warranty Assurance:

At K2 Industries, your satisfaction is our priority, and we stand behind the quality of our products. Here's a brief overview of our warranty:

Defect Coverage:
If you find a defect after receiving your order, get in touch with us. We're committed to resolving the issue, whether it involves a replacement, repair, or refund.

Installation Note:
Please inspect your purchase before installation. Unfortunately, damages post-installation are not covered, so ensure everything looks good beforehand.

Claims Made Simple:
Need to make a claim? Reach out to us at support@k2-industries.com. We're here to assist you. Just keep your original packaging and documentation handy.

Your Satisfaction Matters:
Your trust in K2 Industries is appreciated. We're dedicated to ensuring your satisfaction with our quality automotive parts.

Shipping Information:

At K2 Industries, we strive to provide a seamless and efficient shopping experience for automotive enthusiasts like you. Our commitment is to deliver high-quality parts to your doorstep with the utmost care.

Fast and Reliable Shipping:
Many of our products are stocked in our local warehouse, ensuring swift processing and delivery. Orders placed for these items typically ship within 2-5 business days, allowing you to get your parts in no time.

Extended Selection, Global Reach:
To offer you a broader range of automotive parts, some items are sourced from trusted suppliers around the world. While these products might have a slightly longer processing time, we assure you that the wait is worth it for the exceptional quality and value they bring.

Shipping Transparency:
For products shipped internationally, we provide estimated delivery times on the product page. Rest assured, we are continually working to optimize our supply chain and minimize any potential delays.

Combined Shipments:
To streamline your shopping experience, if your order includes items from both our local warehouse and international suppliers, they may be shipped separately. You will receive separate tracking information for each shipment.

Questions or Concerns?
If you have any questions about shipping or would like assistance tracking your order, our dedicated customer support team is here to help. Feel free to reach out to us at support@k2-industries.com.

You can also track your order here

Thank you for choosing K2 Industries for your automotive needs. We appreciate your trust in us.