GET THE GRANATELLI WIRES, THEY ARE 10 TIMES BETTER THAN THE MSD OR DELCO BRANDS, I INSTALLED THEM AND REALLY COULD FEEL THE DIFFERENCE!! THE TRUCK RAN MORE RESPONSIVE (CRISPER) ALSO THEY TESTED THEM IN CHEVY HIGH PERF MAG AND ON THE DYNO THEY ADDED LIKE 15 RWHP.