Are these spark plugs any good and if so can I get them for my box?

[BoxsterRS]

PLATINUM IR FUSION Part Number 4503 Its says on the bosch site that they will fit my box but I want to know the benefits of irtridirudirudifium plugs vs oem other than what says on the site.

[nick49]

On a stock factory motor the chances of any improvement by using the most expensive, exotic, or any other type of spark plug is slim to none. You have a much better chance of having it run not as well as with the OEM plug. The factory engineers go to great lengths to have a stock plug perform as well can be in regard to ease of starting, correct heat range, maximum performance, fuel economy, and longivity.

Once you start changing the CR, cams, ignition system, fuel delivery system, a plug change may be in order.

[986Jim]

In a forced induction application we have seen some good results from the Denso Iridium plugs, they seem not to blow out as easily causing mis-firing.

One of the biggest problems with high HP cars is mis-firing on the plugs when your tuning on the dyno. When a plug mis-fires it doesn't burn any of the fuel. When the fuel doesn't get burnt the air isn't used up in the cylinder. The O2 sensor see's all this air that's not used during the combustion process and gives a lean reading. Then you have to guess if it's mis-fire or really running lean. Denso Iridiums have solved some of this problem when running 30psi on a 600 or so hp ish motor on the dyno.

Outside of when your running into a problem with your plugs, OEM stuff is just fine. You increase your HP by say 50hp or so with headers, exhaust no cats, intake, chip etc etc.. then a plug 1 range colder than stock will help out.