NGK-BPR9EIX (Iridium) 2-Step Colder Spark Plugs (set of 4) - EVO1-8, Galant VR4 4G63T
Product details
- Vendor NGK
- SKU MK-BPR9EIX4
Specifications:
-
Thread: 14 mm
-
Reach: 19 mm
-
Hex size: 13/16" (21 mm)
-
Heat range: 9
-
Resistor: Yes
-
Electrode material: Iridium center / Nickel ground
NGK Iridium Spark Plug Comparison – EVO 1-8, Galant VR4 (4G63T) Applications
| Feature / Spec | BPR7EIX | BPR8EIX | BPR9EIX |
|---|---|---|---|
| Heat Range | 7 (OEM equivalent) | 8 (1 step colder) | 9 (2 steps colder) |
| Best For | Stock or mildly modified street cars | High-boost street/track cars | Extreme-boost race builds |
| Boost Level | Up to ~20 psi | ~20–28 psi | 28+ psi sustained |
| Electrode | 0.6 mm iridium center / nickel ground | 0.6 mm iridium center / nickel ground | 0.6 mm iridium center / nickel ground |
| Lifespan | ~40–50k km | ~40–50k km | ~30–40k km |
| Prevents Detonation | Good | Better | Best |
| Cold Fouling Resistance | Excellent | Very Good | Good |
| Factory Gap | 0.8 mm (can set to 0.6 mm) | 0.8 mm (can set to 0.6mm) | 0.8 mm (can set to 0.6 mm) |
| Use Case | Daily driving, spirited use | Street/track, higher boost | Drag, circuit, extreme builds |
Which NGK Iridium Spark Plug is Right for My EVO?
-
BPR7EIX – OEM Equivalent (Heat Range 7)
Best for stock to mildly modified EVO1–8 running factory boost or up to ~20 psi. Perfect for daily drivers and spirited weekend use. -
BPR8EIX – 1 Step Colder (Heat Range 8)
Ideal for high-boost setups (~20–28 psi), upgraded turbos, or track-day cars. Helps control combustion temps and prevent detonation under sustained load. -
BPR9EIX – 2 Steps Colder (Heat Range 9)
Designed for extreme-boost race applications (28+ psi) such as drag or dedicated circuit builds. Best in engines running very high cylinder pressures and advanced timing.