Performance Gains: Peak gains of 9 hp and 9 ft-lbs, with gains of up to 15 hp and 18 ft-lbs below 4,000 rpm
We have improved our Carbon Turbo Tube for the FK8. The tube now features even greater volume, allowing the turbo to perform without restriction and delivering even more power. This turbo tube has been designed with the following three main objectives:
1.) Volume: Inlet Diameter - The intake side has been increased from Eventuri’s 78mm to 88mm (OEM is 63mm). By expanding the tube body to 88mm from the connection point with the intake system to match the mass airflow tube diameter, we have increased the cross-sectional area by 96% compared to the stock tube. Because the Eventuri tube has a significantly larger inner diameter, its internal volume is substantial, reducing restrictions in the flow path to the turbo. This allows the turbo to operate more efficiently and spool up to peak boost levels faster. It also enables operation at peak boost while reducing turbine load.
2.) Flow Quality: Simply having a large internal volume is not enough; a flow path that ensures smooth airflow to the turbo is essential. By using high-temperature pre-preg carbon fiber, we achieved a smooth inner surface. In contrast, the stock inlet tube is made of cast aluminum, which has a rough internal surface. Combining this with the smooth curvature of the elbow results in a flow path that minimizes turbulence.
3.) Temperature: The final criterion was to minimize heat transfer to the airflow. Since the stock inlet is connected directly to the turbo, heat is transferred immediately as the turbo spins. Our system utilizes a machined flange that connects to the turbo and a silicone hose with an integrated thermal spacer, preventing the carbon elbow from coming into direct contact with the turbo. This barrier, combined with the low thermal conductivity of carbon fiber through its thickness, reduces heat transfer to the airflow.
Package Contents:
- Carbon Fiber Turbo Tube
- Custom Silicone Joiner (Intake Side)
- CNC Machined Turbo Flange
- Custom Silicone Hose (Turbo Side)
- Laser-cut Stainless Steel Bracket
- Anti-vibration Mounts
Before Ordering
○ Regarding Import Taxes
At the Shafutoya shopping site, we pay the import taxes incurred at the time of import on your behalf, so there will be no additional charges beyond the total amount paid at checkout.
○Compatibility Check
Our entire product database is based on North American vehicles (USDM), so please verify compatibility with Japanese vehicles (JDM) before placing your order. (Please feel free to contact us if you are unsure if a listed product is compatible with your vehicle; our support team will be happy to assist you.)
If you place an order without confirming compatibility, we cannot accept returns due to incompatibility.
Please note that even if items are sorted by selecting the year, manufacturer, and vehicle model using the tabs on our home page, this does not necessarily guarantee a bolt-on fit for Japanese market models.
All products have been translated into Japanese using translation software. There may be confusing expressions, so please contact us if you have any questions before placing your order.
○ 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, there may occasionally be a significant discrepancy between the automatically calculated shipping cost and the actual shipping cost. In such cases, we will contact you individually by email.
All products are generally shipped internationally from our U.S. 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 check the lead time. Please note that all items are shipped via air freight. They are not shipped by sea.
○ Regarding Japanese Vehicle Inspection (Shaken) Compatibility
The products we carry are generally designed and manufactured outside of Japan. Please note that they are not compliant with the "Japanese Vehicle Inspection System," and we cannot provide strength calculation documents or similar paperwork for the Japanese inspection system. Therefore, all parts are sold for the purpose of "use on circuits, private property, or off-road," and installation and use are at your own risk.
○ Regarding Warranty
Please check the contents immediately upon receipt of your order. Since all products are shipped internationally from outside Japan, there may be shipping damage to the packaging or the product itself. Please understand that we will only provide returns, refunds, or replacements for items with shipping damage, defective products, or incorrect items if you contact us within 7 days of receipt. Please note that for products sold through us, all warranty-related support will be handled "exclusively through us." We do not provide support through other companies or distributors located within Japan.