The stock NGK is a good plug.
I have found a bit smoother idle and low end throttle response with the Denso Iridium plugs is several aplications, including my S3.
The Denso Iridium IU27 or IU27a, has a very fine wire tip that is very hard to foul, is very easy for the spark to jump, and lasts a long time. The cheaper NGK iridium has a but larger tip and a different internal construction.
Side note - If you buy several sets of plugs at the same time, put a volt/ohm meter across them and group them by resistance. The ignition likes to see the same resistance across all plugs, and they can vary quite a bit from plug to plug.not a big deal, but the little things add up.
See more on ignition and plugs here:
http://www.thespeedtriple.com/Forums/index.php?topic=376.0
Others may have different experiences and/or recommendations.
I have found a bit smoother idle and low end throttle response with the Denso Iridium plugs is several aplications, including my S3.
The Denso Iridium IU27 or IU27a, has a very fine wire tip that is very hard to foul, is very easy for the spark to jump, and lasts a long time. The cheaper NGK iridium has a but larger tip and a different internal construction.
Side note - If you buy several sets of plugs at the same time, put a volt/ohm meter across them and group them by resistance. The ignition likes to see the same resistance across all plugs, and they can vary quite a bit from plug to plug.not a big deal, but the little things add up.
See more on ignition and plugs here:
http://www.thespeedtriple.com/Forums/index.php?topic=376.0
Others may have different experiences and/or recommendations.