- 06-11 Civic SI Coupe and Sedan
- Fits Civic Si with K20Z3 engine.
- 4-2-1 Tri-Y Design - 409 Series Steel
- CNC cut 3/8" thick flanges
- 2.5" Outlet
The K-Tuned 8th Gen Civic SI Header was specifically designed to optimize the performance and power output of the K20Z3 engine that is found in all 2 and 4 door SI models. The header was developed using a proven 4-2-1 Tri-Y design that delivers power gains almost everywhere in the power band, not just the higher rpm range. Additional performance is accomplished by using large diameter piping to speed up the flow of exiting exhaust gases. We also use stepped piping and smooth transitions that minimize restriction. Fitment past the subframe and sway bar is perfect with extra clearance available for engine movement.
We start with 44mm primaries that smoothly step into 50mm secondaries and finish with a 64mm or 2.5î exit. Our 409 Series 8th Gen Civic SI Header is assembled using mandrel bent, 409 series steel tubing and is fully tig welded. We also use a slightly thicker gauge tubing that allows for better weld penetration and additional strength. The CNC cut 3/8" thick flanges are also double welded and then ported for optimum flow at entry and exit. This header directly replaces the OEM 2 piece design and eliminates the catalytic converter so we included a short 2.5" test-pipe with defouler for the secondary O2 sensor.
WHY CHOOSE 409 STEEL?
After evaluating the price driven exhaust parts market and seeing some of our products copied using very low quality, thin gauge Asian mystery material, we decided it was time to make a move. K-Tuned 409 Series Headers are made with raw 409 series steel which will offer customers a cost savings with no sacrifice to performance and fitment. We wanted to maintain a high level of quality because our stainless headers have had a good reputation for several years now. Our 409 Series Headers are exactly like our stainless steel headers, we only changed the material to save our customers a few dollars. The raw steel finish can be high heat coated or painted to resist rust or left as they are to let nature have its way. These headers are intended for use on simpler street cars that are more about function rather than looks and to be honest some hoods are only opened when needed.
The exhaust parts market is filled with a lot of knock-offs, misinformation and deception. We aren't going to bring company names into this conversation, but some of these replica producing companies are currently selling exhaust products that are said to be X material when in fact the material is not even close to what they say it is. Not all the fault lies on the reseller because there is a lot of mystery material coming out of Asian manufacturing. What some advertise as 304 stainless has been found to actually be 200 series. Another cheat we have seen is cutting down the wall thickness of the piping to cut the cost. The problem with using a thinner gauge material is it weakens the product and can cause premature cracking. We have seen piping advertised as 16 gauge, end up measuring as 18 or even 20 in some cases.
Shipping & Returns
Our return policy varies between products on whether you can return it or not. We do stand by the policy that ALL POSSIBLE returned products will be charged with a 20% Restocking Fee. NO FULL REFUNDS. If you have any questions about returning your items please contact our reps at 732-638-5268 or email email@example.com
We stand by our policy of same day shipping on all in stock items if purchased before 4:30 PM (Eastern-Time). If an item is not in stock, you will have an update as to when your item will ship within 24 hours. Below is a map locating where we do our one day shipping to. If you have any questions about shipping make sure to email us at firstname.lastname@example.org or call our reps today at 732-638-5268.
If by any chance, your package that has been delivered by the carrier is lost/stolen, YOU (THE BUYER) are responsible for working with the carrier and us, Tri-State Motorsports to recover your package. You must contact us and the shipping company within 48 hours of delivery for lost/damage claims. You are covered by the basic insurance amount APPROVED by the shipping center. We DO NOT refund or reship product for claims that are denied by the shipping company.
NOTE: Once the products have been shipped, the order CAN NOT be canceled.
Main Shipping Carrier: UPS
Does this product fit my Vehicle?
Please read the Description carefully. We try our best to put vehicle fitment information on all of our products description. If by any chance your vehicle is not listed and you have a question, feel free to ask one of our experts at 1 (844) - 442-8118 . Please have the product SKU ready.
When will this product ship out?
If the product is in-stock and the order is placed before our shipping cut-off time (4:30PM Eastern-Time), your product will ship the same day. If the product is not in stock, you will have an update as to when your item will ship within 24 hours. Click on the 'Shipping & Returns' tab to view the map locating where we do our one day shipping to. If you have any questions about shipping make sure to call our reps today at 1 (844) - 442-8118.
What's the Warranty on this product?
Unless the product is manufactured by Tri-State Motorsports or TSM Race, ALL Warranties go through the Manufacture directly. Please visit their official website and get in contact with them in regards to your warranty. We will supply you with any invoice or tracking information the manufacture asks you for.
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- To accept Affirm's financing offer, click Confirm Loan and you're done.