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I just had a JLT carbon fiber 127mm CAI, 2.6" pulley, and a tune from Lethal Performance installed on my car, runs great throughout the power band with no issues. Except when I'm cruising on the freeway at 60-70 in 5th/6th mainly these gears with 5%-10% throttle (barely pressing the gas down) it...

I just got my parts I ordered for my 2010 GT500 (2.6" metco s/c pulley, 90mm Auxiliary Idler Kit, JLT 127mm Carbon Fiber Big Air Inake, 93 octane tune, and it came with NGK TR6 Spark Plugs). Do I really need to change plugs? Will I notice a difference if I don't? Car only has 4,400 miles on it...