

The Ford Racing M-12405-35T spark plug set is a high-performance upgrade for your Ford EcoBoost engine. It improves power, efficiency, and durability, and is compatible with most tuners and mods.
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Physical products may be returned within 30 days for any reason, provided that the product has not been installed and is in brand new, unused condition with the original packaging. Once a product has been installed, it is non-refundable.
Digital Products, such as MPT Tunes and HP Tuners Credits, are not covered by this.
Please see our Refund Policy or contact an MPT Expert for more information.
MPT is proud to offer free shipping on most orders over $149.
Free Shipping applies only to the contiguous United States. Shipping and handling charges will apply to all orders outside the contiguous US, with the buyer being responsible for any duty fees or taxes their home country may charge to import goods.
With Free Shipping, we will choose the best shipping method for the order. We use all major carriers, including USPS, FedEx, UPS, and DHL.
Items not stocked at our location may incur additional lead-time or charges.
Please our Shipping Policy for more information.


Proposition 65 (Safe Drinking Water and Toxic Enforcement Act of 1986) is a California law that applies to all companies selling products in California. Proposition 65 requires warnings if a product contains any listed chemical present above very low levels that are known to cause cancer, birth defects or other reproductive harm. Proposition 65’s warning standards are among the most stringent in the world. Proposition 65 is not a product safety law, but rather a “right-to-know” law. Businesses are required to provide warnings to comply with Proposition 65. These warnings are required to be in place for all products offered for sale in California.
There are over 800 chemicals on the Proposition 65 list, which is administered by California's Office of Environmental Health Hazard Assessment (OEHHA), a part of the California Environmental Protection Agency. The list includes naturally occurring and man-made chemicals. Proposition 65 warnings can be seen for a wide variety of everyday consumer products, including Automotive Performance products, and warnings can be seen posted throughout California in a variety of establishments such as hotels, restaurants, automobile dealerships/repair shops, and retail stores just to name a few.
To comply with the requirements of Proposition 65, this warning is present on all products sold by MPT.
More detailed information can be found by going to:
https://www.p65warnings.ca.gov/
If you are looking for a high-performance spark plug set for your Ford EcoBoost engine, look no further than the Ford Racing M-12405-35T cold spark plug set. These spark plugs are designed to handle higher than stock cylinder combustion pressures and deliver a reliable and powerful spark for your engine. Whether you are racing, towing, or just cruising, these spark plugs will ensure optimal performance and efficiency for your Ford vehicle.
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If you have any questions about this product or to report product description inaccuracies, contact the MPT Performance experts at (407) 636-7077 or by email.
MPT is proud to offer free shipping on most orders over $149.
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A Return Authorization Number is required for all returns. Please contact an MPT Expert to obtain an RA # before sending anything back to us for any reason.
MPT tuning charges and license fees are Non-Refundable. The sale is final when MPT has sent the tune file over email. This includes both new tune purchases and tune updates.
Products other than MPT tunes, digital products, and MPT decals may be returned within 30 days for any reason, provided that the product has not been installed and is in brand new, unused condition with the original packaging. Once a product has been installed it is non-refundable. We reserve the right to deny the return, should the product be received and it display signs of installation or unmentioned damage.
For vehicle programmers/tuners, the vehicle must be returned to stock if a program was installed. If a tuning device is returned and has not been returned to stock, a refund will not be issued, and your tuner will not be sent back without a shipping and handling fee.
The customer is responsible for all shipping charges incurred during the return process.
Amount Refunded:
•Returns post marked before 30 days from the date the item was received will be refunded the purchase price, minus a 25% restocking fee and the cost of shipping.
•After 30 days, all sales are Final.
•Shipping charges along with any package insurance are non-refundable. If your purchase was shipped with our Free Shipping option, the cost of the shipping will be subtracted from the total refund amount.
HP Tuners Credits are assigned to the HP Tuners product with the submitted serial number and cannot be transferred. Once you load a tune to your vehicle with the RTD, these credits are Non-Refundable.
Digital products and files that have no ability to be taken back physically, such as an SCT Tuner Unlock, are Non-Refundable.
nGauge Tune License Fee is included in your initial purchase of MPT tunes for the nGauge. This fee is factored into the price of the tunes and becomes Non-Refundable when the stock file has been emailed to MPT.
MPT Decals are Non-Refundable, once they have been received by the customer.
Cold spark plugs designed for tuned Ecoboost engines. Customers praised pre-gapped convenience, fast shipping, and performance improvements including smoother idle, better gas mileage, and resolved misfires. "These are the only spark plugs for an Ecoboost," one customer noted. Highly recommended for tuned vehicles.
Always quick and great customer service. Got these just days after I ordered and always pre gapped to the correct gap. The best company in the business !!
They're spark plugs and they're doing what they should be doing. Seems to idle better/smoother now. Looking back, I probably should've gapped them a little tighter rather than leaving at 0.031. Quick weekend fix!
MPT has been awesome and will be shopping here again!
Had a misfire in my spark plugs after the tune and these spark plugs fixed that all up. Highly recommend the spark plugs if you are applying a tune.
Great service great help any questions or help you great service will do work with them in the future
These are the only spark plugs for a Ecoboost.
I needed to replace my plugs badly. They were causing a nightmare with misfires. I ordered these yograded cold plugs and they solved the problem. MPT is the real MVP because my phone had shipping info saved that was out dated and incorrect. Simply I gave MPT the wrong info and they fixed the order and sent it to me after the fact.
I cannot say enough great things about this company. I ordered these plugs for my 2016 3.5 and when they got lost in the mail, MPT stepped up and replaced my order without hesitation! Hands down one of the best Customer service moves you can make. The plugs work perfectly and perform just like the description says. Buy with confidence from MPT. I've been tuned by them with complete happiness and all my parts come from these guys now. Thank you!
Plugs shipped fast and cheaper than an auto parts store. These are great for peace of mind especially if you have a few upgrades to your vehicle.
after installing these plugs I could tell a good amount of difference in the gas milage and the Quickness coming off the line
The plugs to go with if tuned. Checked the gap and they were all in spec. (Always check the gap) Probably the least inexpensive you'll find and fast shipping.
I always get my plugs from mpt. Gapped correct right out of the box. Fresh plugs smooths the idle out on a tuned raptor especially after you’ve run the old set over 10k miles. And it’s only 6 plugs. My gen 1 had 16. It’s a easy 30 min job . Freshen up your plugs people.
Awsome product really happy
2018 F-150 2.7 with Lots of aftermarket, OEM spark plugs (sp578) (1 step hotter then these plugs) we’re going quick. The truck is very sensitive to the spark plug gap. I called MPT and asked them if there was anything that would help with how fast they were going out. They recommended these which surprised me, Ford does not mention this (only for 3.5) I trusted them and purchased a set.. bet damn aftermarket part so far, lol got tired of replacing them. Truck runs a little smoother, my gas mileage seamed to go up a little, probably my imagination , either way they work for me. They are also Pre-Gapped no need to adjust! Hope this helps someone out.
My Gen 2 3.5 really runs so much better with these plugs. Came ready to install.
Fast Delivery and Excellent performance, They came with a pre gap which was correct when i checked them so no gapping.
Swapped during coil replacement, running with MPT 93 octane tune, great thus far.
Before the plug swap, I had the dreaded shudder, limp mode change, and rough idle. Didn’t figure my plugs were too awful bad. I was wrong. These plugs made a huge difference. Any ailment I may have had is gone. Couldn’t tell on MPG, foot is too heavy to be able to verify.
Another great product. I'm very happy and pleased with the added performance of the plugs they really compliment the 93-PRX tune I'm running. Can't say nothing but good things about these guys and their customer service will definitely use these guys again.
Great plugs they really woke my truck when tune was installed
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The process was much simpler than I expected. The tunes are awesome, and easy to load. It truly does make the truck into what it should be. The only issue is you may go through tires faster.
MPT is great.
Had an ** tune on my 2014 f150 5.0 and put on some tires that were shorter, Ii had to change the tire size and ** stopped offering support for my tune so I switched to MPT everything has been very straightforward. I have been through a few revisions of tunes to get it dialed to my needs but my truck now shifts better, has more power, and runs smoother than it every did with my ** tune. I purchased both the adaptive octane performance trans tune and the 91 performance and both are worlds better than the **. I also like the ability to adjust the idle rpm, tires size, and gear ratio from the SCT tuner before i install the tune, this is something i could not do with **. The customer support is also much better and no bickering or hostility like there was with ** and I appreciate that and the patience of Ross at MPT very much. Would definitely recommend them for your tuning needs! God bless you all at MPT
Will post a video of the acceleration on my youtube soon @Bless-edisYeshuaHamashiach
We have two Can Am Renegade 850's in a 16' enclosed trailer that we pull with this truck. The transmission couldn't make up its mind which gear it wanted, also has larger tires on. The MPT TUNE set everything perfect. Rips awesome! Pulls trailer great! Service is absolutely amazing with all my questions. Installing cold air intake next from Morepowertuning.com
Jose at MPT not only helped me every step of the way he fine tuned my ROUSH F150 to the way it should have come off the assembly line with a historic name on the grill like ROUSH! 0-60 is 1.3 sec faster and top end never stops!!! The historic Ford 10 speed transmission “searching” has also been dealt with. Thank you MPT for making my ROUSH F150 fast
Procharged 2014 mustang 3.7, MPT did a fantastic job remote tuning. I will be back for future tunes for future mods.