15-26 Mustang 5.0 Ford Performance Colder Spark Plug Set (8X)

• Recommended for use with 2011-2026 Mustang GT vehicles running aftermarket Superchargers
• Also fits 2015-2020 F150 5.0 for supercharged applications. 
• One heat range colder than the stock Mustang GT 5.0L 4V Ti-VCT engine spark plugs 
• Similar performance to M-12405-M50, but with more robust construction for race applications 
• 0.035" plug gap for supercharged applications recommended 
• Sold as a set of 8

NOTE: SPARK PLUG GAP MUST BE VERIFIED PRIOR TO INSTALLATION!

ESS Tuning shipping & returns

• Returns: authorized in advance with a return authorization (RMA) number marked on the outside of the package. Parts must be clean, unused, in original condition and packaging, and received within 30 days of the sale date. The customer pays return shipping.
• Restocking fee: 20% on all refunds, except in case of an ESS error. Original shipping costs are non-refundable.
• Final sales: performance ECU software is final after 14 days of delivery or once linked to a car; software and parts for used, custom or non-ESS supercharger systems and special-order items are final.

To start a return or ask a question, contact us with your order number.