GRT Velocity Stacks for Aprilia RS 660 & Tuono 660 E5+ (2025+ EU / 2026+ US)

Product Description

Unlock the full performance potential of your Aprilia RS 660 or Tuono 660 E5+ with the GRT Velocity Stacks Kit, engineered to improve engine efficiency and deliver a stronger, more exciting ride.

Developed through extensive testing and multiple prototype iterations, these velocity stacks are optimized in length and taper to maximize airflow efficiency. The result is increased torque and power in the upper RPM range, delivering stronger acceleration from 8,000 rpm up to the limiter.

Manufactured using high-quality PA12 nylon via 3D printing, the kit ensures excellent durability, precision, and performance.

Beyond performance gains, the kit also enhances the intake sound, producing a deeper and more aggressive tone that adds a true racing character to your bike.

Important:
This kit is only compatible with Aprilia RS 660 and Tuono 660 E5+ models (2025+ EU / 2026+ US).

If you own a 2021–2024 EU or 2021–2025 US model, please use the dedicated kit here:
Velocity stacks 660 for RS and Tuono 660 by GRT

Key Benefits

• Increased torque and horsepower from 8,000 rpm to the rev limiter

• Deeper and more pronounced intake sound

• Precision PA12 nylon 3D-printed construction

• Easy installation with included instructions

• FREE €168 coupon to download a custom ECU map from the UpMap Store (compatible with stock and racing exhaust systems)

Who Is This Product For?

This kit is designed for Aprilia RS 660 and Tuono 660 E5+ owners who want to maximize their bike’s performance on both road and track.

It is especially recommended for riders who:

• Want stronger high-RPM power delivery

• Enjoy a more aggressive intake sound

• Are looking to unlock the full tuning potential of their Aprilia

Technical Specifications

• Material: PA12 nylon (3D printed)

• Compatible exhaust brands: Akrapovic, SC Project, Arrow, Austin Racing, Dominator, Mivv, Spark

• ECU tuning: Custom maps available via UpMap Store (included free with coupon) T800+ for Aprilia RS 660 E5 plus 2025 (USA version 2026)

Upgrade Your Aprilia Today

Take your RS 660 or Tuono 660 E5+ to the next performance level with the GRT Velocity Stacks Kit.

Recommended Accessories

UpMap T800 (Required to Upload ECU Map)

To install the included ECU map, you’ll need the UpMap device available here: T800+ for Aprilia RS 660 E5 plus 2025 (USA version 2026)

Sprint Filter Air Filter

The RS 660 and Tuono 660 are among the few bikes that show significant gains from a racing air filter. We recommend the Sprint Filter for its durability, easy maintenance, and dry operation (no oil required). Availabel here:

Sprint Filter 660 RS Tuono PM176S for Aprilia

Compatibility

• Aprilia RS 660 E5+ (2025+ EU / 2026+ US)

• Aprilia Tuono 660 E5+ (2025+ EU / 2026+ US)

Important Notice

For race use only.

Both the velocity stacks kit and the associated UpMap ECU calibration are intended exclusively for closed-circuit racing use, in accordance with local regulations.

FAQ

What performance improvements can I expect?

The GRT velocity stacks are designed to improve torque and power in the upper rev range, particularly from 8,000 rpm to the limiter, while also producing a deeper and sportier intake sound.

Is an ECU remap required?

While the stacks can be installed without it, an ECU remap is strongly recommended to fully exploit the performance gains.
The kit includes a FREE €168 coupon to download a dedicated ECU map from the UpMap Store.

Are these compatible with older RS 660 / Tuono 660 models?

No. This version fits E5+ models only (2025+ EU / 2026+ US).
Owners of 2021–2024 EU or 2021–2025 US bikes must use the earlier version of the kit linked above.

Can I use them with aftermarket exhaust systems?

Yes. The stacks are compatible with popular aftermarket exhaust systems including Akrapovic, SC Project, Arrow, Austin Racing, Dominator, Mivv, and Spark, especially when paired with the appropriate ECU map.

Are these road legal?

No. These components are intended for racing use only and should be used on closed circuits in compliance with local regulations.