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Audi A4The Audi A4 model offers nimble handling and performance that makes it one of the leading cars in its class. Read more about the Audi A4 in the Audi A4 review.
BKR6E are copper. They work very well, just need to be changed about every 10-12K miles. Still, they cost only 1.50 each comparted to about 14 dollars each for NGK.