These are the lower / leading spark plugs for the Mazda RX-7 Rotary Engine 13B.
Safe for Stock port / Street ported motors.
We recommend using the NGK BUR9EQP for trailing for basic bolt-ons.
NGK Laser Platinum® spark plugs provide high ignitability and longer service life. Dual platinum surfaces ensure slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions.
Sold as a pack:
2 x BUR7EQP
2 x BUR9EQP