Previously NGK was exclusive spark plugs supplier in 2006 -- 2011 when Honda was the standard IndyCar Series engine supplier .
Currently Bosch ( Chevrolet ) and NGK ( Honda ) providing spark plugs for all IndyCar Series cars since 2012 .
Previously NGK was exclusive NGK     in 2006 -- 2011 when Honda was the standard IndyCar Series Honda   .
Currently Bosch ( Chevrolet ) and NGK ( Honda ) providing spark plugs for all IndyCar Series cars since 2012 .