AASCO Lightweight Steel Flywheel – Porsche 718 Cayman GT4 / Spyder / GTS 4.0 Manual

Part Number: 106447-12
Brand: AASCO Motorsports

AASCO Fitment Guide

Upgrade your manual Porsche 718 Cayman GT4, 718 Spyder, or 718 GTS 4.0 with an AASCO lightweight steel DFI flywheel designed to reduce rotating mass and dramatically improve engine response. This 14 lb lightweight steel flywheel replaces the heavier factory 28.5 lb dual-mass flywheel setup on compatible Porsche 718 4.0L manual applications, removing approximately 14.5 lb of rotating mass. The result is a sharper, more responsive engine that revs more freely, responds more directly, and feels more alive during downshifts, heel-toe shifting, and spirited driving.

At DasMotoring, this is one of our favorite upgrades for a manual Porsche. A lightweight flywheel can completely change the character of the car — making it feel sharper, more mechanical, and more connected. If your 718 Cayman GT4, 718 Spyder, or 718 GTS 4.0 has started to feel a little too slow or soulless, this is one of those upgrades that can reignite your love for the car and give it some of that 911 S/T-inspired character and flair.

We have run AASCO lightweight flywheels on our own manual Porsches for years through daily driving, traffic, backroad driving, and track use with excellent results.

This is a great choice for drivers looking for a more responsive, motorsport-inspired feel from their manual 718 4.0L while retaining their existing compatible clutch and pressure plate setup. The AASCO flywheel is a lightweight steel design, which can be a nice balance for street-driven cars that want sharper response without moving to an ultra-aggressive race-style clutch setup.

Fitment

Fits select manual transmission Porsche 718 4.0L models:

• 2020–2023 Porsche 718 Cayman GT4 4.0

• 2020–2023 Porsche 718 Spyder 4.0

• 2021–2025 Porsche 718 Cayman GTS 4.0

• 2021–2025 Porsche 718 Boxster GTS 4.0

This flywheel is intended for select manual transmission Porsche 718 4.0L applications using a compatible clutch and pressure plate setup.

This flywheel is not intended for PDK, GT4 RS, Spyder RS, 718 2.0L, 718 S 2.5L, 981, 987, Carrera, Turbo, GT3, or non-718 4.0L applications unless specifically confirmed.

The 718 Cayman GT4 RS and 718 Spyder RS also use a 4.0L engine, but those models are PDK-only and are not compatible with this manual flywheel application.

Product Details

• AASCO lightweight steel DFI flywheel

• Part number: 106447-12

• Designed for select Porsche 718 4.0L manual applications

• Compatible with select 718 Cayman GT4, 718 Spyder, 718 Cayman GTS 4.0, and 718 Boxster GTS 4.0 manual applications

• Flywheel weight: approximately 14 lb

• Factory 718 4.0L flywheel weight: approximately 28.5 lb

• Approximate rotational mass savings on 718 4.0L applications: 14.5 lb

• Lightweight steel construction

• Reduces rotating engine mass compared to the factory dual-mass flywheel setup

• Helps the engine rev faster

• Improves throttle response and rev-matching feel

• Flywheel-only listing

• Clutch disc, pressure plate, release bearing, hardware, and related installation parts are not included unless specifically stated

Driving Feel

A lightweight flywheel reduces rotating mass at the engine, allowing the engine to gain and lose RPM more quickly. The result is a sharper, more immediate connection between your right foot, the engine, and the gearbox. Rev-matched downshifts feel cleaner, throttle blips feel more natural, and the car takes on a more responsive, motorsport-style personality.

Because the flywheel is significantly lighter than the factory dual-mass flywheel setup, some additional drivetrain noise, gear rollover sound, or chatter may be present. This is normal for many lightweight flywheel conversions and is part of the more mechanical driving experience.

The best way to minimize NVH and gearbox chatter is to avoid lugging the engine. Drivers should never lug the engine to begin with, and this is especially important with a lightweight flywheel. Keeping the engine above approximately 2,000 rpm, or selecting a lower gear when climbing hills or accelerating from low speed, will help keep the drivetrain happier and reduce unwanted chatter. The higher the rpm, the less drivetrain chatter and NVH you will have.

Which Version Should I Buy?

AASCO offers several lightweight flywheel and clutch options across the Boxster, Cayman, Carrera, Turbo, and GT platforms. The correct choice depends on your chassis, engine, transmission, and clutch package.

This listing is for the AASCO 106447-12 flywheel only. It is the right choice if your compatible 718 4.0L manual already has a compatible clutch and pressure plate setup in good condition, or if you are replacing an existing AASCO 106447-12 flywheel and reusing compatible clutch components.

How This Differs From 106435-12-PKG

The 106435-12-PKG listing is the complete AASCO lightweight flywheel and Sachs Sport clutch package. It includes the AASCO 106447-12 flywheel along with the Sachs Sport pressure plate, Sachs clutch disc, release bearing, and required installation hardware.

Choose this 106447-12 flywheel-only listing if you only need the flywheel and your existing clutch and pressure plate setup is compatible and in good condition.

Choose the complete 106435-12-PKG kit if:

• Your clutch is worn or due for replacement

• Your pressure plate is worn, heat-spotted, damaged, or unknown

• You want the flywheel, Sachs Sport pressure plate, clutch disc, release bearing, and hardware matched together as a complete package

• You are converting from the factory dual-mass flywheel setup to a complete AASCO / Sachs Sport setup

Good Candidates for This Flywheel-Only Listing

This flywheel-only listing is generally intended for:

• 2020–2023 Porsche 718 Cayman GT4 4.0 manual applications

• 2020–2023 Porsche 718 Spyder 4.0 manual applications

• 2021–2025 Porsche 718 Cayman GTS 4.0 manual applications

• 2021–2025 Porsche 718 Boxster GTS 4.0 manual applications

• Cars that already have a compatible clutch and pressure plate setup in good condition

• Cars replacing an existing AASCO 106447-12 flywheel

• Drivers who want the lightweight flywheel only rather than a complete clutch package

This flywheel is not intended for the 718 Cayman GT4 RS or 718 Spyder RS because those models are PDK-only.

If you are unsure which version you need, contact us with your year, model, engine, transmission, and current clutch setup so we can help point you toward the correct AASCO option.

Installation Notes

Professional installation is recommended. However, there are DIY how-to guides linked below if you have the tools and equipment at home.

If this flywheel is being installed with a Sachs Sport clutch disc, the larger portion of the clutch disc spring carrier must face toward the flywheel. If the clutch disc is installed backwards, the clutch diaphragm spring may contact the clutch disc, which can result in clutch failure and may not be covered under warranty.

Important Notes

This listing is for the AASCO lightweight steel DFI flywheel listed under part number 106447-12.

Clutch disc, pressure plate, release bearing, hardware, and related installation parts are not included unless specifically stated.

Availability

AASCO Motorsports parts are specialty performance components. Although many items are available from stock, occasional delays may occur if an item is backordered or if AASCO is manufacturing a new batch. If there is a delay, we will provide an updated ETA before fulfillment.

Shipping

• Shipping dimensions: 15 x 15 x 4 in

• Shipping weight: confirm before publishing