Perrin Performance Adjustable Fuel Pressure Regulator Kit 18-21 STI

No Tuning Required
Increase horsepower and torque without ECU recalibration or tune! This part is designed and tested to work safely on your vehicle without any tuning required! However, more power can be gained with proper ECU tuning! Confirm any tune or recalibration you add is specific for ALL modifications added to the vehicle.

High-flow
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.

Replaces Problematic OEM Regulator/Dampener
The PERRIN Adjustable Fuel Pressure Regulator replaces the cumbersome and overly-complicated OEM fuel pressure regulator on your 2008-2018 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.

Adjustability
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.

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.

Construction
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.

Finish
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.

Specs
Port Size -6 with O-ring seal
Pressure Ratio 1:1
Included Orifice Sizes 0.1", 0.2"
Pressure Range 25 psi - maximum pressure fuel pump delivers
Material 6061 billet aluminum
Finish Anodize

P/Ns
PSP-FUL-301

In The Box
(1) PERRIN Fuel Pressure Regulator assembly
(4) Oetiker clamps
(1) M6 Cap screw
(1) M6 Fender washer
(1) M6 Lock-nut
(1) Bracket
(1) 5/32" ID Vacuum hose
(1) M5 Short arm hex key
(1) 3/32 Short arm hex key
(2) Zip ties
Warranty & Instructions

Compatibility
2008-2020 Subaru STI