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Exhaust› Headers, Manifolds and Components

PLM

H-Series Ramhorn 4-1 Header Kit

Name: H-Series Ramhorn 4-1 Header Kit
Brand: PLM
SKU: PLM-H2B-RH-HEADER-KIT
Price: 460.75 USD
Availability: InStock

$525.00 $460.75 Save $64.25

SKU: PLM-H2B-RH-HEADER-KIT

In Stock

Ships by Oct 30

Free Shipping over $200

$100 Minimum Order

Non-Returnable Item

DIY PRO SHOP

Moderate — 2–4 hours

Overview

The PLM Power Driven H-Series Ramhorn 4-1 Header is a performance exhaust component designed for Honda H22 and F20B VTEC engines. Crafted from durable 304 stainless steel and expertly hand TIG welded, this header features a long tube design with a 4-1 merge collector to improve exhaust flow and enhance performance.

It includes a true 2.5" exhaust collector, CNC machined manifold flanges for precise fitment, and 18-gauge mandrel-bent tubing for smooth flow. The two-piece slip-fit design aids in installation, and the kit comes complete with a gasket and all necessary hardware. The header is backed by a one-year warranty.

Show original supplier description

The PLM Power Driven H-Series Ramhorn 4-1 Header Kit (model PLM-H2B-RH-HEADER-KIT) is engineered for Honda H22 and F20B VTEC engines, offering a significant upgrade for performance driving enthusiasts. It is constructed from robust 304 stainless steel, ensuring longevity and resistance to extreme conditions. The header is expertly hand TIG welded, guaranteeing strength and reliability, and features CNC machined manifold flanges for a precise fit. This header boasts a long tube, 4-1 merge collector design, meticulously crafted to enhance exhaust flow and boost performance. The 18-gauge, mandrel-bent tubing contributes to smooth exhaust gas velocity, while the true 2.5" exhaust collector ensures optimal compatibility. Its two-piece slip-fit design simplifies installation, and the kit includes all necessary gaskets and hardware for a complete setup. Installation recommendations include its use for Preludes and H-Series motor swap cars. Buyers should be aware that an aftermarket front cross member may be required or modification (notching) to the existing cross member might be necessary for proper fitment on Preludes. The header's height is adjustable during installation and secured with a provided double-nut system. This product comes with a one-year warranty, reflecting PLM's commitment to quality and customer satisfaction. As with many automotive parts, it is subject to California Proposition 65 warnings regarding cancer and reproductive harm.

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	PLM
Part Number	PLM-H2B-RH-HEADER-KIT
Category	Exhaust

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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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