Here is a highly professional, retail-ready product description tailored for ecommerce platforms (like Lazada, Shopee, or a dedicated performance parts website).
4S1M R1 Universal Adjustable Velocity Stack (36mm / Orange)
Maximize your engine’s intake efficiency and give your build an aggressive, race-ready look with the 4S1M R1 Universal Adjustable Velocity Stack. Engineered by 4S1M (For Speed One Momentum), this high-performance air funnel is specifically designed to smooth, focus, and accelerate airflow directly into your Throttle Body or Carburetor. By optimizing the air volume entering the combustion chamber, it unlocks crisper throttle response and maximum power delivery across the RPM range.
Crafted from premium-grade aluminum via precision CNC machining, the R1 features a stunning, durable hard-anodized orange finish that resists wear while making your engine bay pop.
Key Features
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Precision Airflow Optimization: Shapes and focuses air intake to eliminate turbulence, ensuring a highly concentrated, fast-moving air stream into the intake tract for optimal air-fuel combustion.
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Fully Adjustable Velocity Funnel: Features an innovative threaded design. Easily adjust the length of the stack by twisting the built-in threads to fine-tune intake velocity based on your specific engine modifications and tuning needs.
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CNC Machined Durability: Cut from premium raw material using high-precision CNC technology for an exact fit and perfect structural symmetry.
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Hard-Anodized Orange Finish: Coated with a premium hard-anodized layer that protects against heat and corrosion while adding a striking, vibrant orange aesthetic.
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Universal R1 Fitment: Universally compatible across a wide variety of motorcycle models and engine configurations utilizing a 36mm intake diameter (Throttle Bodies or Carburetors).
Product Specifications
| Attribute | Specification |
| Brand | 4S1M Racing (100% Original) |
| Model | R1 Adjustable Velocity Stack Series |
| Size | 36mm Inner Diameter (Compatible range covers 32mm–36mm setups) |
| Material | CNC-machined Aluminum Alloy |
| Finish | Hard Anodized |
| Color | Racing Orange |
| Fitment | Universal (For matching Throttle Bodies & Carburetors) |
Ideal For:
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Daily riders seeking smoother, more responsive throttle transitions.
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Circuit or drag racing setups looking to squeeze every ounce of induction efficiency out of a 36mm intake.
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Scooter and underbone custom builds (e.g., Vario, Aerox, NMAX, Sonic) looking for premium performance upgrades combined with a bold aesthetic.
Installation Note: Ensure your carburetor or throttle body outer mouth matches the clamp-on dimensions of this 36mm velocity stack. Professional tuning/re-jetting may be required to maximize air-fuel ratio efficiency after installation.
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