When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I really can't comment on E3 spark plugs, but I would recommend NGK PFR6Q Laser Platinum spark plugs. I have an '03 A4 1.8TQ and when I put them in, they did make a difference.