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PERRIN Adjustable Fuel Pressure Regulator (Part Number: )
PERRIN Adjustable Fuel Pressure Regulator (Part Number: )
PERRIN Adjustable Fuel Pressure Regulator (Part Number: )
PERRIN Adjustable Fuel Pressure Regulator (Part Number: )
PERRIN Adjustable Fuel Pressure Regulator (Part Number: )
PERRIN Adjustable Fuel Pressure Regulator (Part Number: )
PERRIN Adjustable Fuel Pressure Regulator (Part Number: )
PERRIN Adjustable Fuel Pressure Regulator (Part Number: )
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PERRIN Adjustable Fuel Pressure Regulator (Part Number: )
PERRIN Adjustable Fuel Pressure Regulator (Part Number: )
PERRIN Adjustable Fuel Pressure Regulator
Subaru STI 2008+
Read 7 Reviews | 6 Q&As
Part # PSP-FUL-301
msrp: $366.00

Only 2 left!

Features & Product Details

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.

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 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.


Adjustable: Yes
Fuel Pressure Gauge Port Size: 1/8NPT
Inlet Size: N/A
Outlet Size: N/A
Mfgr. Warranty: 5 Years
Condition: New Product
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
RallySport Guarantee
WARNING: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.



7 Reviews
4.4 out of 5 Stars
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Customer Photos and Videos
PERRIN Adjustable Fuel Pressure Regulator ( Part Number: PSP-FUL-301)
PERRIN Adjustable Fuel Pressure Regulator ( Part Number: PSP-FUL-301)
Superb bit of kit 6 months ago
Hi all. Running a 2.33 stroker with all the bits from a failed 2.5 forged build. I was still getting the GR stumble @ 2800 revs and troublesome tickover. Excutek software was used in the many map tweaks by one of the best - but still it wasn’t perfect below 3k / off boost. So I did the research and having used a lot of Perrin bits in the past - knew their products were quality and may have my fix. After fitting my fueling was all over the place and worse. So back to the tuner - and we started afresh - mapping from the bottom up a completely new map. Hey presto ! The smoothest bottom end / off boost ever ! Crazy smooth. And better power all the way - even at the very top. 480bhp @ 1.65 bar on a Grimmspeed tmi plus Blouch ‘polka pickle’ 8” hotside. The icing on the cake is a genuine 15% improvement in fuel economy ‘around town’ . Brilliant 🌟. Fantastic product as ever. Perrin is a trusted tuner for sure. Thank you.
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Fuel pressure regulator  11 months ago
The regulator is nice. Just wished Perrin offered push lock fittings. Even as an added option.
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1 of 4 people found the following review helpful
Disappointing product and service buyer beware  2 years ago
First of off I had high hopes for this fuel pressure regulator. It appeared to have pretty good reviews by others and seemed to be made for 08+ STI with easy install. after I installed it I noticed I would have to prime the fuel system several times before the engine would start. Contacted Perrin and they said it was normal. I've owned a lot of aftermarket FPR in the past and my high HP cars never did that. After a few months I noticed the finish corroding. Contacted Perrin and RSD about the problem and no resolve. Perrin's customer service sucks. They will not support there products. That is my experience. I was going to buy a lot more Perrin parts but after that I will remove all the Perrin parts and even the license plate bracket and sell it for cheap because Perrin sucks. Beware of a crappy support and customer service. I will take this FPR off of my car and replace it with something else l, and sell this on eBay starting bid $1 Beware of Perrin's low quality products and lack of support to there customer. Another problem is the NPT port for the gauge is located on the bottom of the FPR. Who mounts there fuel gauge up side down? I never seen such a bad design. I come from the Honda seen and this product sucks period. If I could leave negative stars I would. Do not buy this
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0 of 1 people found the following review helpful
2011 STI Sedan 2 years ago
This was super easy to install. I installed it so that the vacuum line is pointed down and bolted to the existing bracket where the stock fuel pressure regulator attached. Before install, add teflon tape to the the fuel nipples and torque them into place. There is a grub screw that you can put a Fuel pressure Gauge or a line to a gauge in the cockpit. I put a Turbosmart gauge which is very useful if you need a specific fuel pressure. It comes with zip ties but they were not big enough for my personal tastes. Make sure to zip tie everything tight, including the vacuum line. When bolted the Perrin FPR body into place, I used the supplied bolt and nut, added washers, and mylar washer on the FPR body, a few rubber washers between the FPR body and metal bracket, and another on the nut side. It keeps it in place and provides dampening. This does not remove the "pipe banging", but makes the sound more audible. I am not into that sound very much and will do the dampening mod later. I drove to my tuner after install, not recommended, but without boosting or any quick accelerations. I choose this over the COBB FPR because this one is adjustable, was in stock at the time, and was on sale. This FPR kit has the capability to feed a 600 HP monster. I only want Stage 2+.
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Fixed my stumble on 1300+ ID's and DW300c 3 years ago
I recently had a tune and was talked into buying another vendor's fuel pressure regulator before getting on the dyno due to intense stumble I got with the stock FPR. I still had the stumble even after having their kit and their solution was to buy more hardware from them... let's just say I didn't want to buy anymore components from them until I sorted this problem out. I took out their FPR and installed this one, and my stumble is gone. I can't believe the other one costs nearly as much as this one, because the quality on this one is so much better (and it's adjustable!). As others have reported, I now have the smoothest throttle response and engine feel I've had, I'd even say that in comparison to when the car was 100% stock. For example, sometimes the car would gently lurch on and off while engine-braking, now it just gently coasts down through the revs; goes without saying that while accelerating its smooth as silk. Definitely recommend this!
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  • Q: FAQ  bogart2 years ago

    Which is better between this and the Cobb FPR? Thanks
    • 0 of 0 people found the following answer helpful

      A:  One will not be better in terms of quality/performance and will depend on your setup. Perrin's FPR is an adjustable regulator which will offer more setting/options for different setups, whereas Cobb's (Part # COB 315200) is designed specifically for 08+ STI models and is non adjustable.

      Brady R @ RallySport Direct 2 years ago  
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  • Q: Fuel line  Subie6232 years ago

    So this unit just uses the stock oem fuel lines without a problem with stage 2 setup and upgraded fuel pump and injectors? Do the fuel line nipples need to be taken out and put teflon tape, or is it good to use out of the box? Thanks
    • 0 of 0 people found the following answer helpful

      A:  Yes, this is designed to bolt right up in the factory location and use can use the provided line in the kit. The nipples shouldn't have to be removed before installation, but if so.. you can add teflon tape on the threads.

      Brady R @ RallySport Direct 2 years ago  
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  • Q: Fitment with Perrin brake brace  JAGSUBIE153 years ago

    will this have fitment issues on the 2015 sti if i already have a brake brace?
    • 0 of 0 people found the following answer helpful

      A:  This FPR is compatible with the Perrin brake master cylinder brace, but an additional part is required. Some modification may be needed with other brands of braces.

      Zach G. @ RallySport Direct 3 years ago  
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  • Q: Fuel pressure gauge + tune  Mathias3 years ago

    Would this be safe to install and then drive to a tuner shop? Or would be better to install this at the tuners shop right before the tune?
    • 1 of 1 people found the following answer helpful

      A:  We don't recommend driving the car after installing this or any aftermarket fuel pressure regulator until you have a custom tune. It would be best to have this installed at the tuner's shop so they can tune it right away.

      Zach G. @ RallySport Direct 3 years ago  
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