I own a 2001 Ford Mustang, 3.8L V6. I need to change the spark plug wires and am in the market. I've noticed that the prices can range from $30 to $150, and would like to know if spending more money is actually worth it for the part. I know that going for cheap is probably not a good idea, but should I buy the $80 ones or the $140 ones? At what point would I not notice a difference? Feel free to recommend specific brands. Thanks!