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Not many options with the HR, but if you aren't planning on doing anything strange to the car then stock denso iridiums or NGK equivalent work just fine. I got some copper one step colder for nitrous use but I have numbers for a couple different NGK options.
Not many options with the HR, but if you aren't planning on doing anything strange to the car then stock denso iridiums or NGK equivalent work just fine. I got some copper one step colder for nitrous use but I have numbers for a couple different NGK options.