champion copper plus- boxed – rc12yc dependable performance. This champion spark plug features a copper core electrode that provides increased conductivity and heat control for built to iso and sae standards for proven performance superior corrosion resistance copper core center electrode allows for accurate control of heat range for longer life copper plus – dependable performance and durability champion copper plus 71 spark plug (carton of 6) application summary: acura lt. Trk.: 3.2l v6 (97-96), 3.5l v6 (99-98); acura pass. Car: 2.7l v6 (87-87); aston martin pass. Car: 3.2l l6 (98-97), 5.3l v8 (94-90), 6.0l v12 (12-00); audi pass. Car: 4.2l v8 (05-01); bentley pass. Car: 6.7l v8 (99-00), 6.8l v8 (15-06); bmw pass.