99-00 Honda Civic SI EM1 4-1 Style Header Stainless Steel
Specifications Part numbers, fitment codes and shipping
- Brand
- K2 Industries
- Speedzone SKU
- K2-4916-HON-006-EC
- Manufacturer part number
- K2-4916-HON-006-EC
- UPC
- HDS-HC99SI-41
- Category
- Engine Components
- Shipping weight
- 2.0 lb
99-00 Honda Civic SI EM1 4-1 Style Header Stainless Steel
Stainless steel 4-1 header built for the EM1 platform to improve exhaust scavenging and flow. This header consolidates four runners into one outlet, reducing backpressure and freeing up power in the midrange. Constructed from mandrel-bent stainless steel for durability and corrosion resistance.
Key Features
- Mandrel-bent runners - Smooth curves maximize flow without dead zones or turbulence.
- Single outlet collector - 4-1 design consolidates exhaust gas for better spool characteristics.
- Stainless steel construction - Won't rust or corrode over time, maintains performance.
Specs
- Material: Stainless Steel
- Configuration: 4-1 collector design
- Condition: New
Whats Included
- 4-1 header assembly
Frequently Asked Questions
Will this bolt directly to my exhaust manifold gasket and studs?
Yes, this header uses factory mounting points on the cylinder head. You'll need new gaskets and studs are reusable if they're not stripped — grab fresh ones to be safe.
Do I need to prime or paint this header before installation?
Stainless steel won't rust, so paint or ceramic coating is purely cosmetic. If you want it coated for looks, do it before you bolt it on — easier to handle and cure without heat cycles.
Will I need custom exhaust piping to connect this to my downstream system?
Check your outlet diameter against your current exhaust piping. If there's a mismatch, you may need an adapter or custom section — measure before ordering any secondary work.
Full details on shipping times, returns, warranty and cancellations are on our policy page.
Market conditions after 2020 have changed the landscape of automotive parts. Although we stock thousands of items across multiple warehouses and distribution channels, back-orders are unavoidable in today's market. If you need a product quickly, email, message or call us to check availability so we can explore your options.
Email Sales@Speedzoneweb.com
Call 407-846-8430
Text 407-749-6314
Answers to common questions are on our FAQ page.
Under the Influence by Speedzone
Product approval required
Want to promote this product?
Approved Speedzone creators can request access to promote this item.
Request to Promote This Product
Parts Financing
Product Request
Return Policy
Wheel & Tire Builder
Discount Codes
