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Exhaust› Headers, Manifolds and Components

Ktuned

K-Tuned Civic Si Header

Name: K-Tuned Civic Si Header
Brand: Ktuned
SKU: KBH-CSI-K20

$499.99 $436.49 Save $63.50

SKU: KBH-CSI-K20

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$100 Minimum Order

Non-Returnable Item

DIY PRO SHOP

Moderate — 2–4 hours

Overview

The K-Tuned 8th Gen Civic SI Header is a 4-2-1 Tri-Y design header specifically engineered to optimize performance and power output for the K20Z3 engine.

Constructed from 409 Series Steel, it features CNC-cut 3/8" thick flanges and a 2.5" outlet diameter. This header directly replaces the OEM 2-piece design and includes a test-pipe with a defouler for the secondary O2 sensor, eliminating the catalytic converter.

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The K-Tuned Civic Si (06-11) Header is a performance exhaust manifold engineered for K20Z3 engines in 2006-2011 Honda Civic Si models. This header is designed as a direct bolt-on application for both 2-door coupe and 4-door chassis, ensuring a straightforward installation. Its construction utilizes 44mm primaries that smoothly transition into 50mm secondaries, optimizing exhaust gas flow. The design also prioritizes fitment past the subframe and sway bar, providing ample clearance for engine movement.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

Brand	Ktuned
Part Number	KBH-CSI-K20
Category	Exhaust

Videos

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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