Re: i need help with the spark plugs
The TRD ones are too cold for your application. 16 is your heat range, while the TRD ones are using a 24. Denso plugs are rated lower for hotter, and higher for colder (opposite of NGK). The TRD one is probably recommended for the supercharged 4.5L.
If you want iridiums, try SK16R11. It's OEM spec for Toyota, and will last quite a while.
Don't worry about the dual grounds. Toyota used these on some distributor-based V6/I6s and most early direct ignition motors w/ wasted spark to ensure proper firing. The smaller tip on the iridiums requires less voltage and doesn't need an additional ground.
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2005 Tacoma Double Cab V6 4x4 w/ TRD Off-Road pkg., Auto
1991 MR2 V6 (1MZFE)
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