Click to open expanded view

Kline Innovation Exhaust Porsche 718 GT4 / Spyder / GTS 4.0L (2020+)

Price
$9,999.00

Select Material:

Stainless Steel

Select Tips:

Re-Use OEM

Select Manifolds:

None
Currently Backordered - You can still place your order and we'll ship your order as soon as the product is back in stock!

Need some product help?
Installation Services

Don’t worry about the hassle — let our expert team at Forza Motorworks handle the installation for you. Our professional installation ensures everything fits and operates exactly as intended, giving you clean, factory-quality results, proper wiring or mounting, and avoiding the risks of DIY mistakes. You’ll save time, avoid frustration, and get peace of mind knowing the job is done right the first time. Contact us to learn about our installation services and enjoy a seamless upgrade from day one.

FAQ

Shipping Information
For items that are in stock, purchases made after 9am EST will be usually be shipped out in the next 1-2 business days. Please inquire to confirm lead times if you have specific time constraints. Orders will be sent via signature required at our discretion unless otherwise requested.

International Shipping
Any and all customs duties, taxes, import fees, and/or tariffs assessed in connection with the purchase shall be the sole responsibility of the customer/end user.

Return Policy
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return. To be eligible for a return, your item must be in the same condition that you received it, unused and in its original packaging. All returns are subject to a restocking fee based on item and package condition. Buyer is responsible for paying for return shipping costs. If you need a return label, we will email you a return label and deduct cost from refund. Original shipping costs are not refundable. Special order items are not eligible for return.

Cancellation Policy
In order to cancel your order you must email within 24 hours of placing your order or before your order has shipped, whichever occurs first. Special order items are not eligible for cancelation.

Exchange Policy
We have a 30-day exchange policy, which means you have 30 days after receiving your item to request an exchange. To be eligible for an exchange, your item must be brand new in box. Buyer is responsible for paying all shipping costs to exchange product.

Product Description

 

 

The Kline Innovation Valvetronic Exhaust System for the Porsche 718 (982) Cayman GT4, Spyder & GTS 4.0L is a high-performance, valve-controlled catback exhaust designed to transform sound and performance for the naturally aspirated 4.0 L flat-six. Precision engineered with optimized cross-sections and lightweight materials, this system replaces the restrictive factory silencer, opens up exhaust flow, and brings out a more emotional, quad-exotic exhaust character — from refined cruising with the valves closed to an aggressive, free-breathing scream with them open. With modular catalyst options and premium construction, it elevates both the auditory experience and responsiveness of your GT4 or Spyder.

Fitment Notes

  • Fits Porsche 718 Cayman GT4 (982; 2019+) and 718 Spyder (982; 2020+) with the naturally aspirated 4.0L flat-six engine.

  • Direct catback valvetronic replacement for the factory rear exhaust — uses OEM mounting points.

  • Works with OEM over-axle pipes (OAPs) and optional Kline manifolds or downpipes.

  • Modular catalyst options (100 cell, 200 cell, or decat) allow tailoring to performance goals.

  • Recommended for street, canyon, and track enthusiasts who want a richer sound and improved throttle response.

Included

  • Kline Innovation valvetronic catback exhaust assembly tailored to the 718 GT4/Spyder platform.

  • Integrated valve control hardware for adjustable sound modes (quiet cruise to fully open).

  • Premium installation hardware and gaskets for direct bolt-on fitment.

  • Optional Carbon Fiber or Inconel exhaust tip options sold separately.

Product Specs

  • Exhaust style: Valvetronic catback system — variable sound control.

  • Material options: 304 Stainless Steel or F1-grade Inconel 625 components for lighter weight and heat resistance.

  • Cross-sections:

    • X-pipe: ~63.5 mm

    • Silencer transit: ~50 mm

    • Catalyst pipe: ~63.5 mm overall cross-section ~122 mm

    • Manifold primaries ~45 mm; secondaries ~63.5 mm (chosen for balanced torque and top-end power)

  • Catalyst configurations: 100 cell, 200 cell, or decat pipes (depending on local regulations and performance goals).

  • Sound modes: Stealth/quiet with valves closed → raw/higher-volume with valves open

  • Fitment: OEM-style mounts; no cutting/modifications for basic installation.

Product Features

  • Valvetronic exhaust control: Actively modulates exhaust flow for quiet cruising or race-inspired sound on demand.

  • Optimized flow geometry: Tuned X-pipe and silencer layout improve scavenging and reduce backpressure.

  • Modular catalyst choices: Choose between emissions-capable high-flow catalysts or decat pipes for up to ~20 hp gains with tune and AFR correction.

  • Premium construction: Options in Inconel 625 significantly reduce weight and improve thermal resilience over stock.

  • Enhanced tone: More exotic, engaging exhaust character with high-RPM clarity and minimal drone during cruising.

  • Direct bolt-on: OEM flange compatibility and design ensure straightforward installation with existing mounts