SPDZ1 RF V3 Big Tube 4-1 B-Series Swap Header – B16 / B18 / B20 – Fits EG, EK, DC2 & Chassis-Swapped Vehicles

Serious flow. Serious gains. Serious quality.

The SPDZ1 RF V3 Big Tube 4-1 Header is engineered for performance-driven Honda enthusiasts running a B-Series engine swap. Designed to outperform stock manifolds and cheaply made alternatives, this header unleashes real horsepower, offers clearance for A/C and power steering, and fits like a glove in your EG, EK, or DC2 chassis.

Whether you’re building a street sleeper or a track weapon, the SPDZ1 RF V3 brings race-inspired flow, premium build quality, and unmatched reliability — all backed by better flanges, stronger hardware, and superior packaging for peace of mind from checkout to install.

Key Features:

• True 4-1 Big Tube Design: Built for mid-to-high RPM power, offering +10 WHP gains even on stock GSR motors — more with tuning and bolt-ons.
• Full A/C & Power Steering Clearance: No compromises — run full accessories with zero interference.
• 18-Gauge 304 Stainless Steel: TIG welded, corrosion-resistant, and built to withstand daily driving or track abuse.
• Thick CNC Machined Flanges: Heavy-duty flanges machined to spec and thicker than competitors for a warp-resistant seal.
• True 2.5” Collector: For maximum exhaust flow and seamless integration with aftermarket exhaust systems.
• Complete Hardware & Gasket Kit: Comes with everything you need for a clean, hassle-free install.
• Protective Premium Packaging: Shipped in reinforced, custom-fit packaging to prevent shipping damage and ensure your product arrives flawless.
• Designed to fit half size radiators, will not fit full size radiators

Vehicle Fitment:

• 1992–2000 Honda Civic (EG / EK w/ B-Series Swap)
• 1994–2001 Acura Integra (DC2)
• Pre-1965 Chassis w/ B-Series Swap

Why SPDZ1?

SPDZ1 performance headers are built with track-tested precision and enthusiast-driven engineering. We don’t cut corners — we raise the bar. When quality, fitment, and performance matter, SPDZ1 delivers.