99-00 Honda Civic SI EM1 4-1 Style Header Stainless Steel
SHIPPING - RETURNS - WARRANTY - CANCELLATION POLICY
*** Market Conditions after 2020 have changed the landscape of automotive parts. Although we try to stock 1000's of items in our multiple warehouse and use multiple distribution channels, having back-orders are unavoidable in today's market. If you are in need of a product quickly, we suggest email, message, or call us for availability so that we may explore your options.
Email: Sales@Speedzoneweb.com
Call: 407-846-8430
Text: 407-749-6314
Frequently Asked Questions
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.
Our History
For 26 years Speedzone Performance LLC has been providing aftermarket car parts to Central Floridians and 1000's of customers online. What makes us different than all the other places online? We have 3 actual brick and mortar locations where were serve customers daily and find new ways to provide support and assistance to the automotive community at large. From our in house SPDZ1 Brand, to our constantly growing in stock inventory, we strive to make our customer service and ease of purchase stand out from the rest! We are also one of the largest automotive part financing providers anywhere in the United States, and continue to provide more options for our customers every year. We love what we do, and it shows in every product we sell and every new customer who becomes a part of our Speedzone Family.