NGK BPR8EIX 6684 Iridium IX Spark Plug for DSM & Evo 1-8


NGK-6684 (BPR8EIX)


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The NGK BPR8EIX spark plugs are two steps colder than the stock BPR6ES on the DSM and recommended for high-boost builds. For the Evo 8, these are one step colder than stock and great for the mild to medium upgrades. Sold individually. Price is for one plug, please adjust quantity as needed.

Vehicle Fitment:
Mitsubishi 4G63
1992-2005 Evolution I-VIII
1990-1999 Eclipse GST/GSX
1990-1998 Talon TSi
1990-1994 Laser RS
1991-1993 Galant VR4

Part Number: BPR8EIX
Stock Number: 6684
Heat Range: 8
Thread Size: 14mm

More Info:
NGK IX Iridium Series plugs were designed specifically for the performance enthusiast. Fine wire center electrode ensures high durability and a consistently stable spark. Iridium alloy has an extremely high melting point, perfect for today's high-tech, high performance engines. Trivalent metal plating provides superior anti-corrosion and anti-seizing properties. Corrugated ribs prevent flashover. Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer. Copper core aids in heat removal. Triple seals prevent leakage.

Thread Size: 14mm
Thread Pitch: 1.25mm
Seat Type: Gasket
Resistor Value: 5K Ohm
Reach: 19mm (3/4")
Hex Size: 13/16" (21mm)
Terminal Type: Removable Nut
Overall Height: JIS
Gap: .031" (0.8mm)

Center Electrode
Material: Iridium
Type: Fine Wire
Size: 0.6mm
Projection: Projected

Ground Electrode
Material: Nickel
Type: Standard
Shape: Taper Cut
Quantity: 1

Torque Specs:
Cast Iron: 18-25.3 lb. ft.
Aluminum: 18-21.6 lb. ft.

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Customer Reviews

Based on 5 reviews
Joshua Turner
Absolutely fantastic

When I put my order in online. It wasn’t even 24 hours till I got a notification that they were packaging all the I tems and shipping them out. I feel pleased with STM team and there incredible service and products.

Thank you

Clifford Vilbon (Port-au-Prince, OU, HT)


joe (Arlington, TX, US)
Product packaged very well.

Product packaged very well.

ILLARION KOSYAK (Mineralnye Vody, STA, RU)
good items

I bought good quality parts from STM, shipping cost now much higher than before but acceptable.

Carlos Soudre (Santiago, RM, CL)

Very fast

Glad we could help, Carlos : )

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