Adjustable Fuel Pressure Regulator Kit for 2008-17 STI

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Part Number:
PSP-FUL-301 = 2008-2016 STI
Was: $333.00
Sale: $316.35
Save: 5%
Save: $16.65


The PERRIN Fuel Pressure Regulator is designed with adjustability and high-flow fuel regulation in mind that works with fuel systems ranging from stock setups to 1000+ horsepower setups and the best option to fix the stumbling issue present in 2008+ STIs.


Of the (6) -6 ports on the Adjustable Fuel Pressure Regulator, (4) of these ports are used to connect to your fuel rails with maximum flow in mind. Rated to 1,000+ horsepower worth of fuel flow, this kit works perfectly with stock engines as well as heavily modified engines thanks to the interchangeable orifices.

Replaces Problematic OEM Regulator/Dampener

The PERRIN Adjustable Fuel Pressure Regulator replaces the cumbersome and overly-complicated OEM fuel pressure regulator on your 2008-2015 STI. Removing the OEM part along with the two fuel pressure dampeners significantly reduces the common complaint from STI owners that their car stumbles around 3,000 rpm. After years of development, a design was settled upon that works for applications ranging from stock to heavily modified.


The PERRIN Adjustable Fuel Pressure Regulator can be adjusted from 20 psi to maximum fuel pump capacity. This allows for added fuel delivery to your engine without recalibrating your ECU. Included are three interchangeable orifices for stock fuel pumps, larger drop-in pumps, and fuel systems supporting 1,000+ horsepower.

Six Ports for Maximum Flow

There are (6) -6 ports on the Adjustable Fuel Pressure Regulator: (1) for fuel pump feed, (2) for fuel rail feed, (2) for fuel rail return, and (1) for fuel tank return. This allows for easy installation of aftermarket fuel rail kits that utilize more than one rail.

Direct Bolt-On

The PERRIN Adjustable Fuel Pressure Regulator is easy to install as it bolts right into the existing threads where the OEM fuel pressure regulator assembly is normally housed. Installation of this kit requires no special tools.

Auxiliary Port

Unlike competitors' fuel pressure regulators, the PERRIN Adjustable Fuel Pressure Regulator has a port located discretely on the bottom of its assembly. This 1/8th NPT threaded port allows for installation of aftermarket fuel pressure sensors and/or gauges.


Internal components protected under Patent # 6,298,828. These components are licensed to PERRIN Performance for the technology related to the Adjustable Fuel Pressure Regulator's features. Using this proven technology ensures internal components will last the duration of your vehicle's life.


The PERRIN Adjustable Fuel Pressure Regulator comes with a black anodized finish to make certain your part continues to look good and resist corrosion during its use. For your convenience the ports are labelled according to their proper connections.

5 Year Warranty

PERRIN Performance warrants to the original purchaser that all PERRIN products will be free from defects in material and workmanship within a sixty (60) month period from the date of purchase. *Some exclusions apply
» Read Full Warranty

Off Road Use Only

This product is legal in California only for racing vehicles which may never be used upon a highway. Check your local and federal laws prior to installation!
» Learn More


Download Instructions

Warranty Details

This product features a 5 year warranty Read Full Warranty

Tech Department


Compatibility Detail


2008-2017 Subaru STI Yes

If PERRIN Master Cylinder Support is installed, please contact us. An additional part is required.

If another aftermarket master cylinder support is installed, please contact us for support.

In The Box

In The Box

(1) Adjustable Fuel Pressure Regulator assembly
(3) Varying diameter orifices (1) Installed and (2) in subpacket
(2) feet of vacuum hose
All necessary hardware



Port Size -6 with o-ring seal
Pressure Ratio 1:1
Included Orifice Sizes 0.100", 0.150", and 0.200"
Pressure Range 25 psi - maximum pressure fuel pump delivers
Material 6061 billet aluminum
Finish Anodized Black


Shipping Information

  • Item Requires Shipping
  • 3.0 lbs.
  • W5.0000” x H7.0000” x L11.0000”
  • This item ships in its own box.