SKU: 50003-M40I | UPC: 4957266720240 HKS SUPER FIRE RACING M40i for Nissan Skyline R33-R34 RB25DET Toyota JZX100 1JZ-GTE Subaru WRX HKS Super Fire Racing M40i is a high-performance iridium spark plug for turbocharged JDM engines. It fits Nissan Skyline R33-R34 RB25DET, Toyota Mark II Chaser Cresta JZX100 1JZ-GTE, Subaru Impreza WRX GC8 EJ20 and more. This plug provides focused spark energy for quicker combustion, sharper throttle response, and added power in high-rev setups. Key Features 0.4mm Iridium Center Electrode: Pinpoint spark concentration ignites lean mixtures reliably at redline speeds Platinum Ground Electrode with Taper Cut: Accelerates flame growth while minimizing quenching for fuller combustion chamber fill M40i Heat Range: Resists fouling in boosted applications with elevated cylinder temps and pressures OEM Dimensions: 14mm thread, 26.5mm reach, 16mm hex for drop-in replacement without clearance issues Racing Durability: Outlasts nickel plugs under extreme track conditions with consistent output Product Notes For modified or racing engines. stock use possible but performance shines in tuned setups Factory gapped to 0.8-0.9mm. verify with feeler gauge before install Single plug packaging. order sets of 6 for inline-6 or 4 for inline-4 engines Installation Notes Professional installation recommended. Torque to 20-25 Nm (15-18 ft-lbs) using anti-seize on threads Works with OEM ignition coils and plug wires This Part Fits Year Make Model Submodel 1993-1998 Nissan Skyline R33 RB25DET 1998-2002 Nissan Skyline R34 RB25DET 1999-2002 Nissan Silvia S15 SR20DET 1996-2000 Toyota Mark II JZX100 1JZ-GTE 1996-2000 Toyota Chaser JZX100 1JZ-GTE 1996-2000 Toyota Cresta JZX100 1JZ-GTE 1991-2000 Toyota Aristo 2JZ-GTE 1996-2000 Subaru Impreza WRX GC8 EJ20 Why Choose HKS? Motorsport-proven components trusted in JDM racing circuits Exact tolerances from Japanese factory production Advanced materials extend service intervals in demanding conditions Frequently Asked Questions Q: Will this plug fit my RB25DET swap? A: Yes, direct OEM replacement for stock plugs in R33-R34 Skyline RB25DET engines with no modifications Q: What material is the center electrode? A: Pure iridium alloy, 0.4mm diameter for superior spark focus and anti-fouling resistance Q: What is the warranty and lifespan? A: HKS 1-year limited warranty. expect 40,000 miles in street use, longer with proper maintenance Shipping & Handling Method: UPS or FedEx Ground Availability: In stock – ships same or next business day Packaging: HKS OEM box, 3.1 x 1 x 1 inches Weight: 0.1 lbs Reviews There are no reviews yet. Be the first to review “HKS SUPER FIRE RACING M40i” Cancel replyYour email address will not be published. Required fields are marked *Your rating * Rate… Perfect Good Average Not that bad Very poor Your review *Name * Email * Save my name, email, and website in this browser for the next time I comment.
