Exhaust› Headers, Manifolds and Components

Killerbee

EJ Series 4-1 Exhaust Header

$1,689.00

SKU: KBM-HH-2BOLT

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Killerbee KBM-HH-2BOLT is a 4-1 exhaust header designed for high power and RPM efficiency in EJ Series engines. It features short, equal-length primaries for improved transient response and a symmetrical primary design with similar tube lengths and bend geometry. The header is constructed from thick-walled 321 stainless steel for durability and long life.
Show original supplier description
The Killerbee Equal Length 4-1 Holy Header VE MAX is engineered for optimal high power and RPM efficiency, developed with advanced CAD, simulations, and testing. This header features a 4-1 symmetrical design that maintains consistent and high velocity exhaust gas flow as RPMs increase. The primaries are short and equal in length, contributing to improved transient response, and all primaries share similar tube lengths and bend geometry for balanced performance. The Holy Header VE-Max incorporates a high velocity merge collector that transitions into a stepped 2.5" secondary, designed for very high flow applications. The cast collector, made from 347 (321) stainless steel, is stronger than tubing and offers a superior high velocity merge design compared to fabricated tube collectors. Large radius mandrel bends ensure smooth, non-restrictive flow through the exhaust system. Constructed from thick-walled 321 stainless steel, which is alloyed with titanium for higher strength and toughness at elevated temperatures, this header is built for long life. Killer B Motorsport ensures quality with USA manufacturing; each header setup is inspected, assembled, and pressure tested before shipping to guarantee a leak-free setup. This header is compatible with OEM EJ25 oil pans, as well as the Killer B Motorsport Performance Aluminum Oil Pan. It fits all WRX & STi EJ Series Engines. Killer B Motorsport does not warranty wrapped headers.

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

BrandKillerbee
Part NumberKBM-HH-2BOLT
CategoryExhaust
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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.

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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