To customers with the older model FK8 Carbon Turbo Tube
Performance gains: 9 hp and 9 ft-lb at peak, and 15 hp and 18 ft-lb below 4,000 rpm
Introducing the revised Carbon Turbo Tube for the FK8. The tube now features an even larger volume, allowing the turbo to operate without restriction and unlocking more power. This turbo tube has been designed with three primary goals in mind:
1.) Volume: Inlet Diameter - The intake side has been expanded from the Eventuri 78mm to 88mm (OEM is 63mm). From the connection point to the intake system, the diameter has been matched to the airflow tube and expanded to 88mm throughout the main body of the tube. This results in a 96% increase in cross-sectional area compared to the OEM tube. With its significantly enlarged inner diameter, the Eventuri tube contains a greater internal volume, providing an unrestricted path to the turbo. This allows the turbo to operate more efficiently and spool up to peak boost levels faster. It also enables the turbo to operate at peak boost while reducing turbine load.
2.) Flow Quality: A large internal volume alone does not ensure smooth airflow to the turbo. By using high-temperature pre-preg carbon fiber, we have achieved a smooth internal surface. In contrast, the OEM inlet tube is made of cast aluminum, which has a rough internal surface. Combined with the smooth curvature of the elbow, this creates a flow path that minimizes turbulence.
3.) Temperature: The final criterion was to minimize heat transfer to the airflow. Since the OEM inlet connects directly to the turbo, heat is instantly transferred as the turbo spins. In our system, we use a machined flange that connects to the turbo and a silicone hose with an integrated thermal spacer to prevent the carbon elbow from coming into direct contact with the turbo. This barrier and the low thermal conductivity of the carbon fiber reduce heat transfer to the intake air.
Package Contents:
- Carbon fiber turbo tube
- Laser-cut stainless steel bracket
- Anti-vibration mounts
Before Ordering
〇 Regarding Import Consumption Tax
At the Shaftoya shopping site, we pay the import consumption tax incurred at the time of import on your behalf, so there are no additional charges beyond the total amount paid at checkout.
〇Compatibility Check
As our product database is based primarily on North American vehicles (USDM), please confirm the compatibility with Japanese vehicles (JDM) before placing an order. (If you are unsure whether the listed product is compatible with your vehicle, please feel free to contact us. Our support team will be happy to investigate for you.)
If an order is placed without verifying compatibility, we cannot accept returns due to incompatibility.
Please note that even if products are sorted by selecting the year, manufacturer, and vehicle model in the tabs on our homepage, it does not necessarily mean they are compatible with Japanese-spec vehicles without modification.
All products have been translated into Japanese using translation software. As there may be confusing expressions, please contact us before ordering if you have any questions.
○ Regarding Shipping
Shipping costs are paid at the time of checkout. Shipping estimates are calculated automatically when you enter your shipping address on the checkout page. For large items such as body parts, the actual shipping cost may occasionally differ significantly from the amount calculated automatically. In such cases, we will contact you individually via email.
Basically, all products are shipped internationally from our US warehouse. Unlike domestic shipping in Japan, international shipping takes approximately 7 to 14 days, so please allow yourself enough time when ordering. If you are in a hurry, please contact us in advance to confirm delivery times. Note that all products are transported by air; they are not shipped by sea.
○ Regarding Japanese Vehicle Inspection (Shaken) Compatibility
All products we handle are designed and manufactured outside of Japan. Please understand that they do not conform to the "Japanese Vehicle Inspection System," and we cannot provide strength calculation documents or similar paperwork for this purpose. Therefore, all parts are sold for "circuit, private property, or off-road use only," and installation and use are at your own risk.
○ Regarding Warranty
Please inspect the contents immediately upon arrival. Since all products are shipped internationally from outside of Japan, the packaging or the product itself may sustain shipping damage. We will only provide returns, refunds, or replacements for shipping-damaged items, defective products, or incorrect items if notified within 7 days of receipt. Please understand that for products sold through us, warranty-related support will be provided "only through us." We do not provide support through other companies or distributors located within Japan.