Maruha BC Damper — Pro Spec Coilover · NA/NB Miata 1990–2005
The Pro Spec is Maruha's higher-specification BC Damper variant — built by Buddy Club Japan to Maruha's own engineering brief. Designed for the driver demanding sharper response without sacrificing street usability. Features pillow ball upper mounts for more direct steering feedback and alignment precision — the correct choice for drivers who also track their car.
Technical Specifications (from Maruha Motors Japan):

Damper piston diameter: 46.0mm — largest available for the Miata platform
15-step damping adjustment via top click shaft
Spring rates: Front 8.0 kg/mm · Rear 6.0 kg/mm (base)
Extended rear upper mount — 20mm additional stroke eliminates rebound harshness after lowering
Pillow ball upper mounts for sharper steering response vs. rubber-bushed alternatives
Full ride height adjustment via bottom bracket, independent of spring seat
Off-black plated piston bore for sustained low friction
Overhaul (O/H) capable — absorber body replaceable for long-term ownership

Fitment: Mazda Miata MX-5 NA (1990–1997) and NB (1998–2005) — all variants.
Made in Japan. Production lead time 2–3 months. Authorized Maruha import by Chikara Motorsports — North America's only official Maruha dealer.