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AASCO Lightweight Steel Flywheel – Porsche 987.2 Boxster / Cayman 2.9L Manual 2009-2012
Part Number: 106428-12
Brand: AASCO Motorsports
Upgrade your manual Porsche 987.2 Boxster or Cayman 2.9L with an AASCO lightweight steel flywheel designed to reduce rotating mass and dramatically improve engine response. This 18 lb flywheel replaces the heavier factory 27 lb dual-mass flywheel setup on compatible base-model Porsche 987.2 Boxster and Cayman 2.9L models, removing approximately 9 lb of rotating mass. The result is an engine that revs more freely, responds more sharply, 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 987.2 Boxster or Cayman 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 987.2 Boxster or Cayman 2.9L while retaining a flywheel-only setup. The AASCO flywheel is a lightweight steel design, which can be a nice balance for street-driven cars that want sharper response without going to the lightest possible flywheel setup.
Fitment
Fits select manual transmission Porsche 987.2 Boxster and Cayman models:
2009–2012 Porsche Boxster, 987.2 chassis, 2.9L
2009–2012 Porsche Cayman, 987.2 chassis, 2.9L
This flywheel is intended for select manual transmission Porsche 987.2 base-model Boxster / Cayman 2.9L applications listed by AASCO.
This flywheel is not intended for Tiptronic, PDK, 987.1, 986, Boxster S, Boxster Spyder, Cayman S, Cayman R, or 3.4L applications unless specifically confirmed.
Product Details
AASCO lightweight steel flywheel
Part number: 106428-12
Designed for select Porsche 987.2 Boxster / Cayman 2.9L manual applications
Base-model 2.9L steel flywheel application
Flywheel weight: approximately 18 lb
Factory flywheel weight: approximately 27 lb
Approximate rotational mass savings: 9 lb compared to the factory flywheel
Lightweight steel construction
Reduces rotating engine mass compared to the factory dual-mass flywheel
Helps the engine rev faster
Improves throttle response and rev-matching feel
Flywheel-only listing
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 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 similar-looking lightweight flywheel and clutch options for the 987.2 Boxster / Cayman platform. The correct choice depends on your engine, pressure plate configuration, and whether you want the flywheel only or a complete clutch package.
This listing is for the AASCO 106428-12 flywheel only. It is the right choice if you have a compatible 2009–2012 Porsche 987.2 Boxster or Cayman 2.9L manual and only need the lightweight steel flywheel.
How This Differs From 106422-12
The 106422-12 flywheel is for select 987.2 Boxster S/ Cayman S 3.4L applications using the factory OEM pressure plate setup.
The 106428-12 flywheel is the base-model 2.9L steel flywheel application.
Do not assume the 3.4L 106422-12 flywheel is correct for a base 2.9L car. For compatible 987.2 Boxster / Cayman 2.9L applications, use 106428-12.
Flywheel-Only vs. Complete Kit
Choose this 106428-12 flywheel-only listing if your car already has a compatible clutch and pressure plate setup in good condition, or if you are replacing an existing AASCO 106428-12 flywheel and reusing compatible clutch components.
Choose the complete 106428-12-PKG kit instead if:
Your clutch is worn or due for replacement
Your pressure plate is worn, heat-spotted, damaged, or unknown
You want the flywheel, Sachs Performance pressure plate, Sachs Performance clutch disc, release bearing, and installation hardware matched together as a complete package
Good Candidates for This Flywheel-Only Listing
This flywheel-only listing is generally intended for:
2009–2012 Porsche 987.2 Boxster 2.9L manual applications listed by AASCO
2009–2012 Porsche 987.2 Cayman 2.9L manual applications listed by AASCO
Cars that already have a compatible clutch and pressure plate setup in good condition
Cars replacing an existing AASCO 106428-12 flywheel
Drivers who want the lightweight flywheel only rather than a complete clutch package
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.
Important Notes
This listing is for the flywheel only. Clutch components, pressure plate, release bearing, hardware, and related installation parts are not included unless specifically stated.
This flywheel is specifically for compatible 987.2 Boxster / Cayman 2.9L manual applications. Fitment may depend on the vehicle’s model year, engine, transmission, and clutch / pressure plate configuration. Always confirm compatibility with your exact vehicle before ordering.
Professional installation is recommended. However, there are DIY how-to guides linked below if you have the tools and equipment at home.
Before installation, compare the new flywheel and related components to the original components being replaced.
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: 20 lb
Part Number: 106428-12
Brand: AASCO Motorsports
Upgrade your manual Porsche 987.2 Boxster or Cayman 2.9L with an AASCO lightweight steel flywheel designed to reduce rotating mass and dramatically improve engine response. This 18 lb flywheel replaces the heavier factory 27 lb dual-mass flywheel setup on compatible base-model Porsche 987.2 Boxster and Cayman 2.9L models, removing approximately 9 lb of rotating mass. The result is an engine that revs more freely, responds more sharply, 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 987.2 Boxster or Cayman 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 987.2 Boxster or Cayman 2.9L while retaining a flywheel-only setup. The AASCO flywheel is a lightweight steel design, which can be a nice balance for street-driven cars that want sharper response without going to the lightest possible flywheel setup.
Fitment
Fits select manual transmission Porsche 987.2 Boxster and Cayman models:
2009–2012 Porsche Boxster, 987.2 chassis, 2.9L
2009–2012 Porsche Cayman, 987.2 chassis, 2.9L
This flywheel is intended for select manual transmission Porsche 987.2 base-model Boxster / Cayman 2.9L applications listed by AASCO.
This flywheel is not intended for Tiptronic, PDK, 987.1, 986, Boxster S, Boxster Spyder, Cayman S, Cayman R, or 3.4L applications unless specifically confirmed.
Product Details
AASCO lightweight steel flywheel
Part number: 106428-12
Designed for select Porsche 987.2 Boxster / Cayman 2.9L manual applications
Base-model 2.9L steel flywheel application
Flywheel weight: approximately 18 lb
Factory flywheel weight: approximately 27 lb
Approximate rotational mass savings: 9 lb compared to the factory flywheel
Lightweight steel construction
Reduces rotating engine mass compared to the factory dual-mass flywheel
Helps the engine rev faster
Improves throttle response and rev-matching feel
Flywheel-only listing
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 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 similar-looking lightweight flywheel and clutch options for the 987.2 Boxster / Cayman platform. The correct choice depends on your engine, pressure plate configuration, and whether you want the flywheel only or a complete clutch package.
This listing is for the AASCO 106428-12 flywheel only. It is the right choice if you have a compatible 2009–2012 Porsche 987.2 Boxster or Cayman 2.9L manual and only need the lightweight steel flywheel.
How This Differs From 106422-12
The 106422-12 flywheel is for select 987.2 Boxster S/ Cayman S 3.4L applications using the factory OEM pressure plate setup.
The 106428-12 flywheel is the base-model 2.9L steel flywheel application.
Do not assume the 3.4L 106422-12 flywheel is correct for a base 2.9L car. For compatible 987.2 Boxster / Cayman 2.9L applications, use 106428-12.
Flywheel-Only vs. Complete Kit
Choose this 106428-12 flywheel-only listing if your car already has a compatible clutch and pressure plate setup in good condition, or if you are replacing an existing AASCO 106428-12 flywheel and reusing compatible clutch components.
Choose the complete 106428-12-PKG kit instead if:
Your clutch is worn or due for replacement
Your pressure plate is worn, heat-spotted, damaged, or unknown
You want the flywheel, Sachs Performance pressure plate, Sachs Performance clutch disc, release bearing, and installation hardware matched together as a complete package
Good Candidates for This Flywheel-Only Listing
This flywheel-only listing is generally intended for:
2009–2012 Porsche 987.2 Boxster 2.9L manual applications listed by AASCO
2009–2012 Porsche 987.2 Cayman 2.9L manual applications listed by AASCO
Cars that already have a compatible clutch and pressure plate setup in good condition
Cars replacing an existing AASCO 106428-12 flywheel
Drivers who want the lightweight flywheel only rather than a complete clutch package
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.
Important Notes
This listing is for the flywheel only. Clutch components, pressure plate, release bearing, hardware, and related installation parts are not included unless specifically stated.
This flywheel is specifically for compatible 987.2 Boxster / Cayman 2.9L manual applications. Fitment may depend on the vehicle’s model year, engine, transmission, and clutch / pressure plate configuration. Always confirm compatibility with your exact vehicle before ordering.
Professional installation is recommended. However, there are DIY how-to guides linked below if you have the tools and equipment at home.
Before installation, compare the new flywheel and related components to the original components being replaced.
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: 20 lb