Product images and videos 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.

Exhaust› Headers, Manifolds and Components

PLM K-Swap

K-Swap RB 4-2-1 Header

Name: K-Swap RB 4-2-1 Header
Brand: PLM K-Swap
SKU: PLM-HK-HEADER

$460.75

SKU: PLM-HK-HEADER

Free Shipping over $200

$100 Minimum Order

Non-Returnable Item

DIY PRO SHOP

Moderate — 2–4 hours

Overview

The PLM Power Driven RB K-swap 4-2-1 header is designed to maximize exhaust gas flow and broaden the powerband, increasing horsepower and torque. This header utilizes a two-piece design to maximize engine compartment space and delivers power from low to high RPMs. It is constructed from 18 gauge 304 stainless steel and features a true 2.5" collector.

This header is designed to fit 92-00 Civic, 92-97 Del Sol, and 94-01 Integra vehicles when equipped with K20 engine swaps using Hasport or similar engine mounts. It is sold for competition use only and is not street legal in California.

Show original supplier description

The PLM Power Driven RB K-swap 4-2-1 Header is engineered to optimize spent exhaust gas flow and expand the engine's powerband, resulting in increased horsepower and torque across the entire RPM range. Its two-piece design allows for maximized engine compartment space, making it a suitable choice for K20 and K24 engine swaps. The header is constructed from durable 18 gauge 304 stainless steel, featuring a true 2.5" collector and a CNC-machined manifold flange that is approximately 3/8" thick. This header is specifically designed for K-swap applications in 92-00 Honda Civic, 92-97 Delsol, and 94-01 Integra vehicles utilizing Hasport or similar engine mounts. Some assembly is required, and it includes a gasket, springs, and a tool for easier installation. It is important to note that this product is sold for off-road use only and is not legal for use on public roads or highways. Furthermore, it is not for sale in the state of California. The header comes with a one-year limited warranty.

Vehicle Symptoms

Lack of top-end power above 5000 RPM
Engine feels restricted or sluggish during acceleration
Stock exhaust manifold cracked or leaking
Desire for a more aggressive exhaust note
Poor throttle response in mid to high RPM

Relevant Conversations

K-swap header vs stock manifold dyno comparison
PLM RB header review for K20 swap
Best header for K24 swap in 92 Civic
How to install K-swap 4-2-1 header clearance issues
PLM header vs Skunk2 header K-swap
K-swap exhaust sound clip with header
K20 swap header upgrade worth it?
K-swap performance mods: header first?
PLM header fitment 99 Civic K-swap
Forum: RB K-swap header experiences

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

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

Brand	PLM K-Swap
Part Number	PLM-HK-HEADER
Category	Exhaust

Videos

PLM 4-2-1 race header install for my K24 integra!!

PLM K-Series Header Assembly How-To - TSX/RSX/Civic/Accord

How to: Install PLM Header 8th Gen Civic Si k20z3

PLM Header and Exhaust Install On The RSX Type-S

Item Review: Skunk2 Alpha Header Vs. PLM Header 8th gen Si (Upgrade🤷‍♂️)

PLM V2 Header Install On My 8th Gen Civic Si

PLM Header W/OEM Exhaust 8th Gen Civic Si

Install : CRX gets Bisimotor / PLM Header

5,000+ Trusted brands

1M+ Enthusiasts

5M+ Parts sold

(760) 282-4645 hello@motormia.co

Buy with Confidence

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.

View Full Return Policy

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.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy