NGK 9160 RC-ZE21 Spark Plug Wire Set Mazda MX-5 Miata 1990-1997 1999-2000 1.8L

Vehicle Fitment

• 1990-1993 Mazda Miata / MX-5 (Base, 1.6L I4 / B6D)
• 1994-1997 Mazda Miata / MX-5 (Base, M-Edition, R Package, STO, 1.8L I4 / BP)
• 1999-2000 Mazda Miata / MX-5 (Base, LS, SE, 10th Anniversary, 1.8L I4 / BP)

Fitment Notes

• Does NOT fit the 1998 Mazda Miata - the 1998 model year uses a coil-over-plug (COP) ignition system that does not use distributor-based spark plug wires.
• Coil lead wire is not included. Set of 4 spark plug wires only. Sold as a complete set.
• Fits both the 1.6L (B6D) and 1.8L (BP) Miata engines through the same wire set - one set covers all years listed above.

Features

• 7mm variable pitch magnetic core for ultra-low resistance and broad-spectrum RFI/EMI suppression
• High-temperature silicone outer jacket rated to 250°C (482°F) for durability in tight engine bay environments
• Premium fiberglass braided reinforcement over EPDM/silicone inner insulation for superior dielectric strength and tensile resistance
• Stainless steel terminals with silicone-sealed spark plug boot for a watertight, corrosion-resistant, vibration-proof connection
• Numbered wire identification tags for accurate cylinder-by-cylinder installation
• OE or OE-equivalent fit - wire lengths and boot configurations matched precisely to Mazda's B6D and BP distributor ignition layouts

Specifications

• Part Number: RC-ZE21 | Stock Number: 9160
• Wire Diameter: 7.0mm | Wire Color: Blue
• Core Material: Magnetic (Variable Pitch Spiral Core)
• Jacket Material: Silicone | Inner Insulation: EPDM/Silicone
• Noise Suppression: Yes (RFI/EMI resistor type, variable pitch winding)
• Terminal Type: Stainless Steel, Corrosion-Resistant
• Fit Type: Vehicle-Specific (Not Universal)
• Warranty: NGK Lifetime Limited Warranty
• OEM Cross Reference: Mazda 8BBG-18-140 | 8BK1-18-140A | FS01-18-140 | FSD7-18-140B | KL47-18-140C

Included Components

• 4x NGK RC-ZE21 Spark Plug Wires (Stock No. 9160) - complete set; coil lead wire not included

Product Description

The NGK 9160 (RC-ZE21) is a vehicle-specific spark plug wire set engineered as an OE or OE-equivalent replacement for the 1990-2000 Mazda Miata MX-5, covering both the original 1.6L B6D engine (1990-1993) and the 1.8L BP engine (1994-1997, 1999-2000). The 7mm variable pitch magnetic core delivers ultra-low resistance and effective RFI/EMI suppression, while the silicone outer jacket and premium fiberglass-reinforced EPDM inner insulation provide long-term heat and chemical resistance - well-suited to the compact, warm engine bay of the Miata.

Important: The 1998 Mazda Miata uses a coil-over-plug ignition system and is not compatible with this wire set - confirm your model year before ordering. This set covers the distributor-based ignition system used on all other NA and NB generation Miatas within the 1990-2000 range. Wire lengths and boot configurations are precisely matched to the Mazda B6D and BP engine layouts. Coil lead not included. Backed by NGK's Lifetime Limited Warranty.