Air and Fuel› Fuel Pumps, Regulators and Components

AEM

1/2-Inch Fuel Pressure Regulator

$416.99

SKU: 25-111

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

Easy — 1–2 hours

Overview

It features a 1/2-inch fuel bore to accommodate increased fuel flow and dampen backpressure pulses.
Show original supplier description
The AEM High Volume Fuel Rail is engineered to support fuel flow for applications up to 1,000 horsepower, featuring a generous 1/2-inch fuel bore. This larger bore is crucial for managing increased fuel demands in high-performance engines and also serves to dampen the backpressure pulses created by larger fuel injectors, ensuring smooth operation even with stock injector sizes. This fuel rail is constructed to facilitate enhanced fuel delivery and comes with several user-friendly features. It includes an additional 1/8th NPT port, providing a convenient spot for installing a nitrous setup or a fuel pressure gauge. For seamless integration, a custom fuel line fitting for the factory fuel line is supplied. Furthermore, the ends of the rail are pre-tapped to accept standard -6 AN or 9/16"x18 fittings, offering flexibility for users who prefer custom fuel lines. The product includes comprehensive installation instructions, all necessary hardware, fittings, and injector O-rings. Professional installation is recommended. This fuel rail is compatible with the 2002-2005 Honda Civic Si K20 and the 2002-2006 Acura RSX Base and Type S K20 models.

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

BrandAEM
Part Number25-111
CategoryAir and Fuel
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