Iridium spark plugs?

[Septembersrain]

I've got a '13 Yaris. Will this give me any improved performance? Is it worth the money I'd spend? What kind came stock?

Thanks.

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[keiri]

The owner's manual for the '12 says that the car comes with Iridium plugs and only Iridium plugs should be used - I'd say you'll continue with the performance you've been seeing.

[fnkngrv]

Spark plugs alone will never net you any performance gain in modern cars.

[Septembersrain]

I need some advice on non-warranty voiding tweaks/mods that I can do?

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[KCALB SIRAY]

I need some advice on non-warranty voiding tweaks/mods that I can do?

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Please, everyone who reads this in the good ol' U.S.A. take note!

The Magnuson-Moss Warranty Act is the right for consumers to have the vehicle serviced at a business of their choice and the option to use aftermarket parts, meaning potentially money-saving alternatives to those that came on the car, while retaining the original warranty. The automaker is not allowed to void a warranty just because a nonfactory part is used.

Where things can get sticky is when the work or parts are associated with a problem are deemed by a dealership as not performing correctly or are otherwise defective. You have the right to seek alternatives to the dealer for repairs or parts, but remember that good work and good parts are key to a good ownership experience.

Should something go wrong, the warranty provider will need to determine the cause of the problem. The Federal Trade Commission says, “The manufacturer or dealer must show that the aftermarket or recycled part caused the need for repairs before denying warranty coverage.” That means if the dealer can prove (the burden is on the dealer) the problem was caused by the wrong viscosity or a poor quality oil filter, your warranty can be denied. Warranty protection would still be in effect for other parts of the cars.