Wanna buy my diamond coated Platinum coil? Sell it real cheap...//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gifI use whatever the application calls for //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Generally for a higher powered driver I pick aluminum and for lower powered either copper or CCAW.