--- product_id: 186808089 title: "Racing (M-12405-35T) 10-17 Flex 3.5L EcoBoost Cold Spark Plug Set" brand: "ford" price: "€ 149.47" currency: EUR in_stock: true reviews_count: 13 url: https://www.desertcart.sk/products/186808089-racing-m-12405-35t-10-17-flex-3-5l-ecoboost store_origin: SK region: Slovakia --- # One heat range colder for peak performance Vehicle-specific fit ensures seamless installation Precision gapped to .031 inches for optimal ignition Racing (M-12405-35T) 10-17 Flex 3.5L EcoBoost Cold Spark Plug Set **Brand:** ford **Price:** € 149.47 **Availability:** ✅ In Stock ## Summary > ⚡ Ignite your EcoBoost’s true potential with Ford Racing precision! ## Quick Answers - **What is this?** Racing (M-12405-35T) 10-17 Flex 3.5L EcoBoost Cold Spark Plug Set by ford - **How much does it cost?** € 149.47 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/186808089-racing-m-12405-35t-10-17-flex-3-5l-ecoboost) ## Best For - ford enthusiasts ## Why This Product - Trusted ford brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Race-Ready Ignition:** Experience smoother, cleaner engine performance with plugs engineered one heat range colder than stock. - • **Plug-and-Play Upgrade:** Sold in a convenient set of 6, making your tune-up quick, easy, and professional-grade. - • **Precision Gap Engineering:** Factory-set .031 inch gap guarantees consistent spark and improved fuel efficiency. - • **Tailored Fit for Your Ride:** Designed specifically for 2010-2017 3.5L EcoBoost engines, ensuring perfect compatibility and hassle-free installation. - • **Durability Meets Performance:** Nickel top and copper core materials deliver long-lasting reliability under high-stress conditions. ## Overview The Ford Racing M-12405-35T Cold Spark Plug Set is a high-performance upgrade designed specifically for 2010-2017 3.5L EcoBoost engines. Featuring a heat range one step colder than stock and a precise .031 inch gap, these plugs enhance ignition efficiency, reduce misfires, and deliver smoother engine operation. Crafted with a copper core and nickel top for durability, this set of six plugs ensures a perfect vehicle-specific fit, making it the ultimate choice for enthusiasts seeking reliable, race-inspired performance. ## Description One Heat Range Colder Than Stock. Sold In A Set Of 6. Gapped To .031 in.. Review: 2020 Limited 3.5 HO - Use to replace my stock plugs at 40k after I got the 5 star tune. This helped stop the little stuttering at idle and the truck runs a lot smoother and cleaner. I got these per 5 stars recommendations as they are high performance. This was the easiest tune up I’ve never done, took me 20 minutes,10 minutes per side. Just make sure to get dielectric grease. I bought the boots but my truck came with a different kind of boot. Only problem is that if one of them breaks or is bad and you need to replace it you cannot buy them individually. Ford doesn’t even sell this part number anymore and you have to special order the spark plug if you need to replace one. The gap is closer is closer to .28 but if you’re tuned that’s ok. Honestly for the price and how fast you get them you can’t beat them, but I did have one go bad and I had to pay $13 to try to find one individually at that point you might as well just buy a new set. Review: Absolutely outstanding !! - After tuning my 3.5 ecoboost and noticing a misfire on cylinders 1 and 5, I moved coils around. The misfire remained on same cylinders and I had good compression so the plugs were not performing well. I bought these due to colder heat range and closed the gap to .028" and the truck runs amazing. It runs smoother than it ever has !! ## Features - Innovative three-layer structure engineered to protect the interior of your vehicle with style, safety, and comfort in your daily ride - Please reference the submodel information located on the far left within the Compatibility table under "Notes" - Many products require vehicle-specific fitment - View the Compatibility table to ensure the part fits your year, make, model and submodel ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07HW1T57N | | Automotive Fit Type | Vehicle Specific Fit | | Best Sellers Rank | #39,927 in Automotive ( See Top 100 in Automotive ) #253 in Automotive Replacement Spark Plugs | | Brand | Ford | | Brand Name | Ford | | Compatible with Vehicle Type | Car | | Core Material | Copper | | Customer Reviews | 4.6 out of 5 stars 352 Reviews | | Gap Size | 0.03 inches | | Included Components | Spark Plugs | | Item Type Name | Spark Plugs | | Manufacturer | Ford Racing | | Manufacturer Part Number | M-12405-35T | | Manufacturer Warranty Description | Manufacturer Warranty | | Model Number | M-12405-35T | | Number of Items | 1 | | OEM Equivalent Part Number | M-12405-35T | | Thread Size | M14x1.25 | | Top Material Type | Nickel | | UPC | 756122008324 | | Unit Count | 1 Count | | Vehicle Service Type | Car | ## Product Details - **Brand:** Ford - **Core Material:** Copper - **Thread Size:** M14x1.25 - **Top Material Type:** Nickel - **Vehicle Service Type:** Car ## Images ![Racing (M-12405-35T) 10-17 Flex 3.5L EcoBoost Cold Spark Plug Set - Image 1](https://m.media-amazon.com/images/I/41JSp5SK3gL.jpg) ## Questions & Answers **Q: Will this work on a 2015 ford taurus sho 3.5l ecoboost?** A: Yes, I have them certainly installed in my 2015 Taurus SHO. They came gapped perfectly at .030 which is the latest recommendation for the 3.5 ecoboost. **Q: Are these already properly gapped ?** A: F150 ecoboost are supposed to be at 28 so always double check **Q: Will these fit my 2016 expedition with the 3.5 turbo eco boost? and will they come pre gapped?** A: Yea they will fit and noticed they are pre gapped to .28-.30 **Q: Are these the original sp542 ? Or the new replacement?** A: Yes these are the SP542 plugs. Ford discontinued the 542s and went with the performance version only now. The markings on the 542s and these plugs are exactly the same. ## Customer Reviews ### ⭐⭐⭐⭐⭐ 2020 Limited 3.5 HO *by T***S on May 4, 2024* Use to replace my stock plugs at 40k after I got the 5 star tune. This helped stop the little stuttering at idle and the truck runs a lot smoother and cleaner. I got these per 5 stars recommendations as they are high performance. This was the easiest tune up I’ve never done, took me 20 minutes,10 minutes per side. Just make sure to get dielectric grease. I bought the boots but my truck came with a different kind of boot. Only problem is that if one of them breaks or is bad and you need to replace it you cannot buy them individually. Ford doesn’t even sell this part number anymore and you have to special order the spark plug if you need to replace one. The gap is closer is closer to .28 but if you’re tuned that’s ok. Honestly for the price and how fast you get them you can’t beat them, but I did have one go bad and I had to pay $13 to try to find one individually at that point you might as well just buy a new set. ### ⭐⭐⭐⭐⭐ Absolutely outstanding !! *by C***S on August 29, 2025* After tuning my 3.5 ecoboost and noticing a misfire on cylinders 1 and 5, I moved coils around. The misfire remained on same cylinders and I had good compression so the plugs were not performing well. I bought these due to colder heat range and closed the gap to .028" and the truck runs amazing. It runs smoother than it ever has !! ### ⭐⭐⭐⭐⭐ Legit OEM cold spark plugs to fire up your Ecoboost! *by S***. on March 9, 2026* Exact Ford OEM replacement plugs for my 2.7 Ecoboost. Perfect manufactured date was less than 3 months prior to installing, giving me the assurance these plugs were not pulled off a dusty shelf. Plugs came pre-gapped at proper 0.028. Exceeded my expectations and performing flawlessly after install and my truck engine running smoothly again. ## Frequently Bought Together - Ford Racing (M-12405-35T) 10-17 Flex 3.5L EcoBoost Cold Spark Plug Set - Permatex 22058 Dielectric Tune-Up Grease, 3oz. - High Performance Dielectric Grease Used To Protect Terminals, Spark Plugs, Wiring And Other Electrical Connections Against Salt, Dirt, And Corrosion - Motorcraft WR6135 Ignition Spark Plug Boot --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sk/products/186808089-racing-m-12405-35t-10-17-flex-3-5l-ecoboost](https://www.desertcart.sk/products/186808089-racing-m-12405-35t-10-17-flex-3-5l-ecoboost) --- *Product available on Desertcart Slovakia* *Store origin: SK* *Last updated: 2026-10-04*