Stainless Steal Manifold Header for Honda Civic EX (2001-2005) 1.7L SOHC Engine

Upgrade your '01-'05 Civic EX with a performance header designed for the D17A2 1.7L engine—gain horsepower, improve throttle response, and enjoy a sportier exhaust note.

Wake Up Your D17A2: Real Gains, Real Performance

The seventh-gen Civic EX earned its reputation as a dependable daily driver with excellent fuel economy and Honda's signature build quality. With the D17A2 1.7L engine under the hood, these cars delivered a solid 127 horsepower—enough to get the job done, but not exactly thrilling. For enthusiasts who wanted more, the aftermarket answered with proven bolt-on upgrades that extract hidden potential without compromising reliability.

This stainless steel header is one of the most effective first mods you can make. By replacing the restrictive factory exhaust manifold with a high-flow 4-into-1 design, you're giving your engine the breathing room it's been missing. The result is an instant 10-15 horsepower and torque gain, sharper throttle response, and a deeper, more aggressive exhaust tone that turns heads without being obnoxious.

Key Features at a Glance

• T-304 Stainless Steel Construction: Superior corrosion resistance and heat tolerance compared to mild steel, ensuring years of trouble-free performance.
• Optimized 4-1 Design: Efficiently merges exhaust gases to reduce backpressure and improve engine scavenging across the RPM range.
• 1.50" Primaries / 2.25" Collector: Tuned specifically for the D17A2's displacement and flow characteristics.
• Metal Gasket Included: High-quality gasket ensures a leak-free seal right out of the box.

Installation & Fitment

This header is a direct bolt-on replacement for your factory manifold. While experienced DIYers with basic hand tools can tackle the install, professional installation is highly recommended to ensure proper fitment and torque specs. Everything you need is included—hardware, gasket, and the header itself—so you can get it installed and start enjoying the gains immediately.

Durability & Material Details

T-304 stainless steel isn't just a fancy marketing term—it's a material engineered to handle the extreme heat cycles and road conditions your Civic faces. Unlike mild steel headers that rust and crack after a few winters, this header maintains its structural integrity and appearance season after season. It's a smart investment that pays off in both performance and longevity.

Your Benefits at a Glance

• Noticeable Power Increase: Feel the difference during acceleration and highway merging.
• Enhanced Exhaust Sound: A sportier tone that reflects your Civic's performance potential.
• Foundation for Future Mods: Pairs perfectly with a cold air intake or cat-back exhaust for even more gains.

Specifications

Fitment:

• 2001-2005 Honda Civic EX
• D17A2 1.7L 4-Cylinder engines only
• Verify compatibility with your specific year and model before ordering

Package Includes:

• 1 x Stainless Steel Header
• 1 x Metal Exhaust Gasket
• All necessary mounting hardware