If you're looking to boost your Subaru WRX's performance, the Manley 37mm Race Flo Intake Valve is a game-changer. Designed specifically for the 2.0L EJ20 engine from 2002 to 2003, this valve is crafted with precision and quality that Manley Performance is known for, having over 40 years of experience in manufacturing top-tier stainless steel valves.
The Manley valves are engineered to excel in even the toughest conditions. With chrome stems that not only look great but are also built to last, these valves feature swirl polished under heads and fully hardened tips. Each valve is precisely machined for optimal performance, ensuring a perfect fit and enhanced airflow.
These valves are not just for show; they are designed to outperform the competition. The "Pro-Flo" design reduces the stem diameter in the fillet area, resulting in increased airflow and reduced weight, making it a perfect addition for both street performance and high-powered race applications. With Manley, you can trust that you're getting a product that is ready to handle the demands of your Subaru WRX.
Specifically designed for the Subaru WRX 2.0L EJ20 (2002-2003), the Manley 37mm Race Flo Intake Valve is an excellent upgrade for anyone looking to enhance their engine's performance. Before installation, it's advisable to check your valve guide size to ensure proper clearance, as you may need to hone the guides when replacing stock factory valves.
Many users have praised the Manley valves for their durability and performance. Customers have noted significant improvements in engine responsiveness and power output after installation. The quality of craftsmanship has also received high marks, with several reviews highlighting the precision and reliability of the valves during both daily driving and competitive racing.
In summary, the Manley 37mm Race Flo Intake Valve is a reliable choice for Subaru WRX enthusiasts looking to maximize their engine's potential. With its robust design and proven performance, this valve is sure to meet the demands of both street and track applications.
Note: We recommend checking your valve guide size to achieve the proper valve stem to guide clearance. Guides may need to be honed when replacing stock factory valves.
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Vehicle Make/Model | Year | Trims |
|---|---|---|
| Subaru Impreza | 2002-2003 | WRX |

Manley Performance, formerly called Manley Speed Equipment, was established in 1966 by Hank Manley shortly after his graduation from Brown University. His interest in the performance and racing traced back to 1960 when, at age 17, he rebuilt a 312 CID Ford V8 engine, installed a camshaft and three two-barrel carbs, and raced a ’56 Thunderbird on New Jersey’s streets. Initially, the company’s product lineup included stainless valves, lifters, camshafts, forged pistons, vanadium valve springs, pushrods, and timing chain kits. By 1998, Manley had outgrown its first Bloomfield, New Jersey facility and bought several acres in Lakewood, New Jersey. It was around this time that the brand’s name formally changed to Manley Performance. Nearly a decade later, the production space doubled in size.
Evolving in the Automotive SpaceLed by GM Michael Tokarchik in 2002, Manley entered the high-performance passenger car market as an OEM supplier of connecting rods for the 2003/2004 Ford SVT Mustang Cobra. Production reached 2500 rods per week without missing a single delivery date. Ford awarded Manley its highest ever supplier rating. Manley’s presence in the OEM market continued from there as a supplier for the Ford GT. After nearly 50 years since its inception, Manley continues to be globally recognized as the leading manufacturer of performance valves, connecting rods, cylinder head components, pushrods, drive and oil systems, and several other engine parts.
What is Manley’s Specialty?Manley Performance specializes in high-performance engine internals that range from stock replacements to full-on race applications. They have been the standard of the industry since their inception; a fact that still remains true now as they have ventured into new markets. Today, Manley Performance continues to re-define itself in a high-performance aftermarket industry that is constantly evolving. The brand has developed a wide range of new products for growing markets that include sport compact, Ford modular, and Chevy LS. Manley also maintains its leadership role with the traditional V8 engine business.
Get Manley Performance at Vivid RacingIf you are in need of a serious upgrade to your engine, then Manley Performance parts should be on your list. Like all of our suggested manufacturers, Manley uses the best materials available to ensure a quality part for your engine. We carry Manley connecting rods, crankshafts, pistons, and valve components. The large lineup of domestic parts includes sport compact vehicles, Ford modular engines, GM’s LS series internals, and HEMI product upgrades for Chrysler.
If you can’t find what you’re looking for or need help choosing the right part for your car, call our sales team at (480) 966-3040. We are here to make your buying experience a breeze.