Maruha RS Header (Racing Split Header) · NA6CE / NA8C Miata MX-5
Maruha's own-design split-type exhaust manifold built around a 60.5mm main pipe — meaningfully larger than the standard 50.8mm used by competing headers. This specification traces directly to Maruha's N2 race program at FISCO circa 2000, where their special B6 engine with 60.5mm piping demonstrated the headroom needed for serious high-rev builds. The RS Header is designed from the ground up for tuned engines — not stock applications.
Technical Specifications (from Maruha Motors Japan):
Main pipe diameter: 60.5mm (vs. 50.8mm on standard Maxim Works units)
Split-joint (分割式) design — remove and reinstall without dropping the full exhaust
Available separately for NA6CE (1.6L B6ZE) and NA8C (1.8L BP-ZE)
Full stainless steel construction
Dyno and race validated by Maruha's own engine program
Designed to pair with Maruha F-Cam, Race Cam, and ITB builds for maximum top-end output
Manual transmission only
Limited production run from Maruha's Shizuoka facility. Pre-orders sell out — early reservation strongly recommended.
Made in Japan. Authorized Maruha import by Chikara Motorsports — North America's only official Maruha dealer.