NGK makes a good spark plug. To do an honest test on the 350Z you would have to use just the engine on an engine dyno and have a computer controlled program that runs the engine through a program that is duplicated the same for each set of plugs tested.

It wouldn't be an accurate test to test the engine with the used stock plugs that are already in the engine because they have been in there for a while. Putting any brand, new, fresh set of plugs in the engine would most likely show an increase in horse power not just Pulstar.

I guess I need to see a valid, honest test by a non biased engine lab using blind labeled sets of plugs.

Good hard emperical evidence for me. I still think that if a new plug technology came out everyone would jump on the bandwagon, auto manufacurers a really under a lot of pressure to increase the fleet average mpg and would more than welcome and jump on the Pulstar technology. They would either buy the plugs from Pulstar or buy the patents and farm out the manufaturing to an existing plug manufacturer. It would be my guess that Pulstar plugs are now produced by an existing plug manufacurer for Pulstar. As a Senior Sales Engineer I have personally seen this done.

It's no secret that Champion spark Plug produce many different brands in their plants including Mopar brand and Chrysler original equipment plugs. As a Senior Sales Engineer I got to tour many different kinds of manufacturing facilities and you would be surpised who produces what. We of course tested the plugs the competition produced to see if there was any clear advantage, all manufacterers do this. We had, and I presume still do have, a state of the art engine testing facility were I worked with many computer controlled engine dyno's and some whole vehicle dyno's.

When I was manageing a shell station right out of High School, I was thrying to sell my 1966 Chevy SS and a guy came in to look at the car and asked what kind of plugs I had in it. I answered that I had Champions in it and he said he owned a Sohio station and only used Atlas brand spark plugs, which he sold as a Sohio brand because they were a super plug. Because my father worked at Champion I knew that those Atlas plugs were rolling off the Champion line right down the street in Toledo Ohio. This illustrates the point that I always make in the Forum that many times an increase in performance or quality is a "percieved" thing. Maybe some one here on the forum can provide some data on plug performance backed by good hard emperical evidence. I would love to see it. Meanwhile I will put in the brand and heat range that comes out of my vehicles.

Whew! That was long winded, I hope somebody reads it.