GFB FX-S Bosch Fuel Pressure Regulator

Marsoni

M251S

$114.97

Get it in 3 business days with 1 day shipping. Friday, May 29

GFB FX-S Bosch Fuel Pressure RegulatorIf you increase the performance of your engine, you need to ensure your fuel system can deliver the goods or you're going to have a bad day! Upgrading the fuel pump is the first step, but doing this alone will usually result in excessive fuel pressure, especially at idle. This is because the factory Bosch regulators typically don't flow enough to support larger fuel pumps, especially with turbo E85 setups that demand high fuel flow rates.

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I was skeptical at first. How can such a quality performance air filter be so affordable? It fits perfectly and seems to perform and look exactly like the other name brand layered cotton gauze, steel meshed lifetime air filter. I sprayed some K&N oil on this thing and it feels like the engine is breathing a little easier now and performing a little better. As with anything new, your mileage will vary.

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Reviewed in the United States on October 19, 2025

Verified Purchase

big j

Fort Morgan, US

★★★★★ 5

It's better than the paper filters

Awesome air filter 👌

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Reviewed in the United States on March 7, 2026

Verified Purchase

Daniel Raymond