I have a 2007 Scion tc, Cold air intake, Dc sports Headers, Full exhaust, Okada plasma direct plugs (i know it doesnt make a difference unless im boosted but i plan on turbocharging soon but for now im N/A), 2 inch drop, light weight crank pulley, light weight flywheel, and a stage 2 clutch. Im changing to a different brand of spark plugs, i want to go Denso,but i dont know whether to buy the denso platinum TT or the Denso Iridium Power, I really dont want NGK right now, but anyone that has any of my set up or similiar with either of those plugs can u give me some insight on which u think is better for my set up??? im not trying to buy them one at a time because its not cheap... Thanks for all your help

 

there really is no need to get different plugs for the setup you have. They are very minor "upgrades" that dont require a different plug for optimal performance. The only time you would need to get different plugs is when you do boost, which requires one step colder plugs.

The stock ngk plugs are iridiums to begin with. And for an 07, there really is no need to change your plugs so often. I say stick with what you have until you boost, otherwise your just throwing away money.