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I like the Bosch +4, in a test of several spark plugs done by TPIS (Tuned Port Induction Specialties), the +4 out performed the Splitfire by 6.4 hp and 6.2 ft-lbs of torque. The standard bosch platinum plug performed as well as the splitfire and resisted detenation better.
Based on this, I looked into a set of the Rapidfires. Anybody know what makes them so good and so much more expensive than the generic champion for instance?
Based on this, I looked into a set of the Rapidfires. Anybody know what makes them so good and so much more expensive than the generic champion for instance?