I would personally go with your tuners specs,if Torrie recommends new plugs and a new stat along with a tune,there are reasons besides better performance and thats keeping the engine as cool as possible,cause the E.B platform has a tendency for getting hot,besides the tune itself putting the extra stress on the motor and drivetrain,and having to change your plugs more frequent alone is a perfect example to follow your tuners specs,in order to get the most benefit from your car and as a safeguard for any issues to arrise,if you waited this long to get a tune,why not follow your tuners specs,two 8mm bolts and extra coolant,easy peasy,no dis intended.Z