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Kline Valvetronic Exhaust System Porsche 718 GT4 RS

Price
$99,999.00

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Stainless Steel

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None

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Re-Use OEM
Currently Backordered - You can still place your order and we'll ship your order as soon as the product is back in stock!

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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 Cat-Back Exhaust is a high-end performance exhaust system engineered specifically for the Porsche 718 Cayman GT4 RS. Designed to reduce weight, enhance throttle response, and deliver a more aggressive exhaust tone, this system replaces the stock rear silencer with lightweight and precision-tuned components constructed from either F1-grade Inconel 625 or high-quality stainless steel. Featuring Kline’s valvetronic technology, the system offers dual-mode sound control—refined and quiet for everyday driving, or raw and unfiltered under hard acceleration. With optional high-flow catalytic configurations and expertly harmonized cross sections, this exhaust elevates both performance and performance sound without compromising daily drivability.

Fitment Notes

  • Designed for Porsche 718 Cayman GT4 RS models (982 generation, 2022–present).

  • Direct bolt-on replacement for stock rear exhaust section; uses OEM mounting points.

  • Available in valvetronic configuration with fully bypassable design for aggressive sound.

  • Optional catalyst choices include 100-cell, 200-cell, or decat pipes.

Included

  • Valvetronic cat-back exhaust assembly (rear section) with X-pipe integration.

  • Choice of materials: F1-grade Inconel 625 or premium 304 stainless steel (depending on variant).

  • Hardware, gaskets, and mounting fittings for direct fit installation.

  • Electronically-controlled exhaust valves with actuator system.

Product Specs

  • Cross-Section Geometry: X-pipe diameter ~63.5mm for optimized flow and scavenging.

  • Silencer Transit Diameter: ~50mm for balanced tone and flow.

  • Catalyst Pipe Diameter: ~63.5mm with catalyst options up to 122mm overall cross section.

  • Manifold Primaries: ~45mm; secondaries ~63.5mm.

  • Material Variants: F1-grade Inconel 625 for maximum lightness and heat resistance or 304 stainless steel for durable performance.

  • Weight Savings: Substantial reduction versus stock silencer depending on material choice.

Product Features

  • Valvetronic Sound Control: Dual-mode exhaust tone—quiet urban cruising with valves closed and a raw, performance-oriented sound with valves open.

  • Optimized Exhaust Flow: X-pipe and harmonic cross sections improve gas escape and throttle response.

  • Material Performance Options: Choice of Inconel 625 for extreme lightness and heat durability or stainless steel for balanced daily use.

  • Aggressive Tone Characteristics: Removal of restrictive components combined with high-flow catalysts or decat options creates an exotic, high-pitched exhaust note.

  • Track-Ready Gains: Up to ~20 hp when paired with high-flow catalyst or decat pipes and proper AFR tuning.

  • Carbon Fiber Tips: Available option for premium rear aesthetics (sold separately).