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Exhaust› Headers, Manifolds and Components

Jackspania

4-1 Header System

Name: 4-1 Header System
Brand: Jackspania
SKU: JSR11372

$363.70

SKU: JSR11372

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Non-Returnable Item

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Moderate — 2–4 hours

Overview

The Jackspania JSR11372 is a full race side exit header designed for Honda Acura B series engines. It features a 4-1 design with four tubes merging into a true merge collector and a specialty megaphone.

The header is designed for high-compression, fully built engines (2.0L and up) and is ideal for use with race gas, E85, or nitrous. It is intended for those aiming for 250+ horsepower and includes hardware for easy installation.

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This 4-1 header design features four tubes merging into a true collector, complemented by a specially designed megaphone. This setup is optimized to create a scavenging effect, which directly contributes to increasing horsepower and torque. It is built for high-compression, 2.0L and up, fully built engines, and performs exceptionally well with race gas, E85, or nitrous oxide, targeting builds aiming for 250+ horsepower. Fitment is provided for EG, DC, EK, and EF chassis equipped with a B series engine swap. However, due to its full-race nature, some modifications may be necessary. These can include removing the air conditioning system, extending the O2 sensor cable, and potentially utilizing a half-size radiator, a tucked radiator setup, or a slim fan. Included hardware facilitates installation. While reviews praise the welds and value for the price, one user reported a warped header flange requiring machining.

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	Jackspania
Part Number	JSR11372
Category	Exhaust

Videos

Jackspania B Series Big Tube Drag Header Review - Install & Fitment on my 1995 Honda Civic B16A

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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.

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.

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