screw the iridiums not neccessary for bang/buck value, NGK plats will work just fine, Bosch work just fine. I would do spark plugs later on in the future pull one and see how it is. How many miles on the car and service records showing plugs were changed. i think pick up a set of decent NGK platinum plugs or what ever is recommended for the car iridiums are way to pricey and you might might might might might get like 3 hp. SERIOUSLY. Save that money for a port/polish job on the intake manifold.