Spool IFX350 Upgraded DI Injectors +40% [S63 Gen 2]

QT Parts is a Finnish online store.

Our warehouse is located in Nokia, Finland.

You can collect your order directly from us if needed. Simply select “Pickup” at checkout.

Pay securely with multiple payment methods, including invoice and installment plans through Klarna.

The delivery time for products in stock is 1-5 business days. We ship worldwide.

If the product is not in stock and it is a pre order product, the average delivery time is 5-21 business days. If the product has a longer delivery time than previously announced, we will be in touch. International orders may be subject to VAT, import duties, and customs fees upon arrival in the destination country.

Terms for product returns:

• You must return the ordered products within 14 days of receiving
• The products must be unused and without damages
• Commission fee for handling returns is 21,90€
• For product returns, the customer is in charge of the return costs. Only door to door service (Express)
• Shipping costs are not refunded

For international orders sales are final and non-refundable. Once an order is placed, it cannot be canceled or returned. By placing an order, you acknowledge and agree to these terms.

Return address: QT Parts, Vasarakatu 8B, 37150 Nokia, Finland.

Pre order / made-to-order products

If the product you have ordered is a pre order or made-to-order item, it is not subject to the 14-day right of withdrawal or return under consumer protection laws, as the product is manufactured or sourced specifically based on the customer’s individual order.

If you wish to cancel your order before receiving the product, we will refund 50% of the total order amount.

This condition applies to the following product categories:

• Suspension
• Engine Tuning
• Engine Parts
• Exhaust Systems
• Fueling
• Turbochargers/superchargers
• Drivetrain
• ECE-approved Downpipes

All of the above products are manufactured or sourced individually based on the customer’s order, and therefore cannot be returned after delivery, unless the product has a manufacturing or material defect.

In the event of such a defect, the standard liability for defects as provided by consumer protection legislation shall apply.

Spool Performance is proud to introduce its updated DI injector solution for the Gen2 S63 platform — the IFX 350.

Not only are these injectors the highest performance DI injectors available for the S63 engine, but they are also precisely engineered to maintain the smooth idle and light load characteristics of the engine. They are the perfect choice for enthusiasts who want more power without sacrificing OEM-level reliability and maintaining full factory control of direct injection.

The IFX 350 injectors offer a significant flow capacity of approximately 40% greater than standard injectors, enabling significant performance upgrades without the need for additional fuel systems. The injectors’ advanced design ensures a consistent fuel delivery at pressures up to 390 bar , improving fuel atomization and combustion efficiency — especially important at high power levels. Combined with the FX350 high-pressure pumps, the IFX 350 effortlessly supports the journey to four-digit horsepower figures.

Each injector has been carefully developed and tested to ensure perfect compatibility with the latest software on the Gen2 S63 platform — while maintaining factory idle and light load characteristics. The end result is a direct plug & play installation with no compromises .

Main features

• Improved flow: 40% higher flow capacity compared to standard nozzles

• High pressure capability: Works reliably up to 390 bar

• OEM Operation: Retains factory idle and light load characteristics and full Bosch CVO repair capability

Utilizing the full potential of the nozzles requires programming changes . Spool Performance offers comprehensive support and calibration assistance for tuning.

Each IFX 350 nozzle set comes with a 1-year warranty , ensuring product reliability from the moment of purchase.

Customer promise

We value our returning customers. If you have previously purchased an FX350 high-pressure pump from us, please contact us with your order number to receive a one-time 15% discount code for IFX 350 nozzles.