Does spark plugs increase horsepower?

Related questions

1. Which spark plug is better iridium or platinum?
2. How long will a spark plug last?
3. What happens if spark plug gap is wrong?
4. Is NTK the same as NGK?
5. What is the difference between hotter and colder spark plugs?
6. Which is better NGK or Denso Spark Plugs?
7. How often should you change your spark plugs?
8. Can Oil ruin spark plugs?
9. What is the advantage of Iridium spark plugs?
10. What do NGK Spark Plug numbers mean?

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