Originally Posted by
Mugenfreak
preference...i like NGK IX iridium tip spark plugs personally...though most spark/ignition upgrades are minimal on most cars they can help to prevent future problems..you have boost and detonate...you'll wish you upgraded the ignition/spark system
Ignition upgrades are completely unnecessary. There are plenty of guys running 500+ whp on stock ignition. If you have a problem with detonation, look at the tuner, not the ignition system. MSD stuff is junk and the source of many ignition problems for these high-hp guys.
I prefer NGK copper plugs. Iridium plugs have been known to have the little super-hard tip of iridium melt off into the combustion chamber and cause some real problems. Copper plugs will yield the best spark but they have a short lifetime.