S&S Cycle
S&S, Premium M8 55mm CNC ported black manifold
S&S, Premium M8 55mm CNC ported black manifold
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Fits as a direct replacement upgrade for the standard 55mm manifold. It is a better; stronger and a more heat resistant replacement for the stock plastic (polymer) manifold. Made of T6 heat treated cast aluminum that is CNC machined on outside; but also CNC machined / ported on inside; for the ultimate in high-flow characteristics. Adds 3 to 5 horsepower and up. Especially above 124" the stock manifold becomes a restrictive part. Complete with a rubber O-ring seal. Easy to install; re-using all stock parts.OEM replacement reference 27300121. Note: For replacement O-ring seal see 974061.
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Why buy from Forty5°
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Verified compatibility
Every part we ship is checked against your bike's platform, year, and engine. If it doesn't fit, we tell you before you check out.
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Workshop installation
Book a serviceHave us fit it. Book installation at parts intake — same-day on most jobs, master techs only.
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Founder-led aftersales
Get in touchQuestions after fitment? You'll speak to the people who installed it. We answer email and WhatsApp seven days a week.