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Fuel Pressure External Regulator Bypass Plug w/ Gauge for LS1 Intake Manifold Rail

Marsoni M251S
Sale price$30.99
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Get it in 3 business days with 1 day shipping. Friday, May 29
Fuel Pressure External Regulator Bypass Plug w/ Gauge for LS1 Intake Manifold RailBypass plug with integrated port for fuel pressure monitoring or sensors This bypass plug is designed to replace the factory fuel pressure regulator on LS1 intake manifold rails when using an external fuel pressure regulator. Unlike standard plugs, this version includes a 1 8" NPT threaded port to allow installation of a fuel pressure gauge or sensormaking it ideal for tuning or diagnostics. Compatible with 19972006 5. 7L LS1 engines. Includes 1 plug
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4.6 ★★★★★
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Javier
West Palm Beach, US
★★★★★ 5
Muy buena, tal cual lo que buscaba
Color: Black Tonal, Size: Standard
Muy buena, tal cual lo que buscaba
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Reviewed in the United States on April 7, 2026
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Amazon Customer
Birmingham, US
★★★★★ 4
Almost perfect.
Color: Navy, Size: Coin
Really nice wallet. I love Herschel quality. One issue with this specific wallet is the coin pocket on the inside. Cool idea it's just the snap for the pocket rubs on whatever the card is on the other side of the wallet. I had to move my license to a different spot before it was ruined.
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Reviewed in the United States on January 23, 2026
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Nicole L Guido
Port Orchard, US
★★★★★ 5
Herschel wallet
Great quality, fast shipping, no complaints!
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Reviewed in the United States on March 4, 2026
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paul lango
Grantham, US
★★★★★ 5
Good product
Color: Black, Color: Black
It works well and holds plenty. If your pockets are shallow, you might consider the shorter version. It is good RFID protection.
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Reviewed in the United States on May 3, 2026
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A.L.K
Omaha, US
★★★★★ 5
Super quality for a good price
Color: Ivy Green
Very fashionable little wallet. For the minimalist who doesn't like carrying alot in your pockets. This is perfect!
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Reviewed in the United States on March 31, 2026

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