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In sohc engines(like my old metro and escort and dads jetta) i saw the best improvement with autolite platinum plugs. They are cheap from walmart and worked well. Bosch have a wierd thing where the way they route the spark tends to slow it down very minutely, but enough to basically retard the timing so anything i have tried those things on have lost alot of power and mileage. On the dohc(my civic si and my g/fs old tracker) i saw the best gains with ngk iridium plugs. My scooters and mothe rin laws bike run best on iridiums as well(i think its the fact that the tiny electrode doesn't get as dirty because it's so small). But those are my findings so far. Haven't tried pulstar though.
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