SKU: 64465387095

Holley Universal EFI Boost Reference Regulator (HO512-504-5)

Sale price$333.45 Regular price$370.50
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Ships within 48 hours · Estimated delivery Aug 1 - Aug 6

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Description

Holley Universal EFI Boost Reference Regulator (HO512-504-5)HO512 504 5 HOLLEY 1: 1 BOOST COMPENSATING Part Number: HO512 504 5 This precision adjustable fuel metering regulator is the ultimate fuel pressure control unit designed to work on all naturally aspirated EFI, turbo and supercharged applications like vehicles that run in the Pro Street, Pro Import and Outlaw classes. This is a 2 port 1: 1 boost compensating return style regulator that is adjustable from 15 65 PSI + boost reference and is designed to

HO512-504-5 - HOLLEY 1:1 BOOST COMPENSATING

Part Number: HO512-504-5

This precision adjustable fuel metering regulator is the ultimate fuel pressure control unit designed to work on all naturally aspirated EFI, turbo and supercharged applications like vehicles that run in the Pro Street, Pro Import and Outlaw classes. This is a 2 port 1:1 boost compensating return style regulator that is adjustable from 15-65 PSI + boost reference and is designed to be used in conjunction with any electric EFI fuel pump. Features built in gauge port, mounting bracket, two AN -8 O-ring Fittings and a AN-6 O-ring return fitting. All racing Regulators come Black hard anodised for ultimate durability.
Features:

Allows Adjustment from 15-65 PSI + Boost Reference
Bolts In Stock Location
Easy Installation
Designed to regulate high fuel demands for naturally aspirated EFI, turbo, supercharged and NOS race applications
Engineered to regulate extreme flow volumes generated by racing fuel systems
-8AN & -6AN O-Ring style fittings included to adapt to steel braided fuel lines
CNC Machined Billet Aluminium

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 64465387095

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4.0 ★★★★★
Based on 17 reviews
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Verified Purchase
Shreya R
Lexington, US
★★★★★ 5
Perfect for my Honda Accord 2022
Size: 14-22 2.0L hybrid
Perfect for my 2022 Honda Accord hybrid EXL.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
G
Verified Purchase
Guy Ledin
Whiting, US
★★★★★ 5
Amazing
Size: 18-22 2.0L
Great quality and the price is amazing!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 28, 2026
D
Verified Purchase
Dawn Marx
Carnegie, US
★★★★★ 5
It works and fits
Size: 14-22 2.0L hybrid
Worked perfectly.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 30, 2026
J
Verified Purchase
Jorge
Bozeman, US
★★★★★ 5
Beautiful
Size: 18-22 1.5L
I love it
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Reviewed in the United States on April 16, 2026
T
TYH
Alexandria, US
★★★★★ 5
Great quality Cabin and air filter bundle pack. Very solid quality.
Size: 18-22 1.5L, Size: 18-22 1.5L
First off, I like that it's a combo pack instead of me having to buy each one individually and being able to change both at the same time. Now, I must say the quality of both of them is fantastic; I'm really impressed. It's not made out of cheap junk; it feels solid and seems like it will do a good job filtering out all the debris and dirt. It was extremely easy to install and fit perfectly like an OEM air filter and cabin air filter on my Honda Accord. The cabin air filter is definitely a solid piece, and you don't have to worry about it getting crushed or deforming as it's padded, I would assume the reason for the padding on the side of the cabin air filter is that no debris or dust sneaks through which gives it a snug fit which is very smart honestly. The same applies to the air filter that goes under the hood; it definitely feels like a quality piece. A quality filter definitely keeps outside odors and smells from coming inside the cabin, allowing you to get fresh, clean air when you turn your AC on. Overall, definitely a solid purchase, and I will definitely be back to buy this exact bundle pack in the future as it's well-built and fits like a glove. So, you're definitely getting great value for your money with this specific engine and cabin air filter combo pack. There are a lot of garbage ones out there, so if it were flimsy and felt like a cheap filter, I would be giving this one or two stars. But I'm actually quite impressed with this company, and it seems to be doing a fine job. My AC does work better after installing these new filters, and of course, the car runs better with the air filter installed.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 24, 2026

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