Description
Part Number: AF4212-400
Aeroflow 4-into-1 Stainless Steel Merge Collector (2-1/8″ to 4″)
Engineered from high-grade T304 stainless steel, the Aeroflow AF4212-400 merge collector merges four 2-1/8″ primary tubes into a single 4″ outlet, optimizing exhaust pulse scavenging and velocity for peak performance.
Key Features & Performance Benefits
- ☑ T304 Stainless Steel Construction: Durable, heat-resistant, and highly resistant to environmental corrosion under extreme motorsport conditions.
- ☑ Hand-Ported Internal Pyramid: Precision hand-finished interior transition eliminates internal restriction to optimize scavenging and gas velocity.
- ☑ 2-1/8″ to 4″ Merge: Combines four 2-1/8″ inside-diameter primary inlets into a high-flowing 4″ collector outlet.
- ☑ Broadens Torque Curve: Smooth transition reduces backpressure and power loss to maximize total engine output.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Aeroflow Performance |
| Part Number | AF4212-400 |
| Collector Style | 4-into-1 Merge Collector |
| Primary Inlet Size | 2-1/8″ (54mm) ID |
| Outlet Size | 4″ (101.6mm) OD |
| Material | T304 Stainless Steel |
| Internal Finish | Hand-Ported Merge Pyramid |
What’s Included in the Box
- 1 x Aeroflow AF4212-400 T304 Stainless Steel 4-into-1 Merge Collector (2-1/8″ to 4″)
As an official UK distributor for Aeroflow Performance components, JP Racing supplies authentic motorsport products with fast UK shipping and technical customer support. Contact our team for advice on custom manifold and header fabrication.







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