Originally posted by: sareg
Not all spark plugs are created equal.
Some spark plugs can improve performance, while others offer long life. Some can make your lawnmower easier to start, while others resist fouling. For most of the applications you look up at this site, whether its for a car, boat, lawnmower or generator, you will find the prices for a plug as low as $2 or as high as $12 (although we stock some hand made Japanese racing plugs which have a retail price of $100 per plug). So why spend $12 for a spark plug when a $2 plug will screw in and start your car? Well, to be honest, if you are just tuning up your car to pass smog so you can sell it, it isn't cost effective to purchase the highest quality iridium or platinum plug. But if you are planning on keeping that car or the outboard motor you're tuning up, the plug you choose can improve ease of starting, acceleration, fuel economy, as well as how soon you have to change them again. In short, there are horsepower and mileage improvements available from different spark plugs.
To help you decide which plug is best for you we have categorized according to quality level and construction features. We have also explained and illustrated the differences in what may appear to be similar plugs.
Whichever NGK, Denso, Champion, Autolite or Splitfire spark plugs you're looking for, we'll have it in stock. Sparkplugs.com maintains the most comprehensive spark plug inventory in the world, and we ship immediately. That is why we're the first choice for consumers and installers worldwide.