The NRW-Design Billet Aluminum Spark Plug Tubes are a premium upgrade for aging or damaged spark plug tubes on BMW’s S65 and S85 engines. Designed to permanently resolve oil intrusion into the spark plug wells—a common issue with OEM plastic tubes—these CNC-machined aluminum replacements deliver unmatched durability, perfect fitment, and long-term reliability.
Each tube is machined from solid 6061-T6 aluminum and anodized for corrosion resistance. Unlike plastic factory units that can deform, crack, or loosen over time, NRW’s billet solution ensures a consistent seal and a secure hold, even in high-heat environments and motorsport applications.
Product Details
Fits BMW E9X M3 (S65 V8) and E6X M5 / M6 (S85 V10)
Direct replacement for OEM spark plug tubes
CNC-machined from 6061-T6 billet aluminum
Anodized finish for heat and corrosion resistance
Prevents oil seepage into spark plug wells
Compatible with OEM and NRW valve cover gaskets
Made in the USA by NRW Design
Sold as a complete set
x8 for S65
x10 for S85
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TERMS (REQUIRED)
OFF-ROAD USE POLICY & EMISSIONS COMPLIANCE NOTICE
California Proposition 65 Warning:
This product can expose you to chemicals such as lead and lead compounds, which are known to the State of
California to cause cancer or birth defects or other reproductive harm. For more information, visit
www.P65Warnings.ca.gov.
Under the federal Clean Air Act (42 U.S.C. §7522(a)(3)), it is illegal to manufacture, sell,
install, or use any part that defeats or alters a motor vehicle’s emission control system for use on public
roads. Unless a product has received an Executive Order (EO) from the California Air Resources Board (CARB),
it is not legal for use or installation on any pollution-controlled vehicle driven on public highways.
Civil penalties up to $4,819 per violation per vehicle
Possible criminal penalties under the Clean Air Act
Revocation of registration or smog certification by DMV or local authorities
State & Local Regulations:
Some states have CARB-equivalent or independent emissions laws. Customers are responsible for verifying local
regulations before purchasing or installing emissions-related products.
Intended Use & Customer Certification:
All performance, racing, or competition parts sold by this company are intended solely for off-road,
closed-course, or competition use on vehicles that are never registered or used on public highways.
Company Policy Statement
Kies Motorsports, LLC sells and markets these products for lawful use only. We do not condone or authorize the
use of emission-control defeat devices or any modification that violates the Clean Air Act or state
regulations.