Whats better iridium or platinum?

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Tags

1. #normal
2. #usually
3. #spark
4. #worth
5. #springing
6. #iridium
7. #plugs
8. #compression
9. #difference
10. #engine
11. #boost
12. #other
13. #higher
14. #might
15. #material
16. #copper
17. #platinum
18. #whereas
19. #modified