OP. If you are the least bit concerned about warranty issues. Leave your car alone. An air filter change, as well as a throttle body may give you some gains, but they wont transform your car into a pro mod.
sounds like you want performance, but are concerned about warranties.
There is no free lunch. Air cleaner and throttle body modifications will net you some power gains. And may present problems at the dealer should you need to take the car in.
It is an entirely personal decision whether or not you chose to mod.
the mods you have mentioned will give you a limited power increase. it is up to you, to weigh out the consequences.
In my case, I was willing to forfeit the warranty, to get, what I wanted. Not everyone has that inclination.
So my advice to you is , enjoy your car for what it is. And when and if you decide to seriously mod it, forget about warranties. Because one you decide to cross the line, there is no turning back.
So,to make a long story short. lower restriction air cleaner, bigger throttle body = miniscule increases. On a stock, motor.
2011 GT. Grabber Blue. Procharged. 3:73 manual.Billit LCA's. Corsa Extremes. GT 500 wheels. Racemaster DR's. T-56 Tremec. Dynotech DS . Centerforce DF. American Racing headers/high flow cats 560 rwhp.Donny Walsh tuned
2012 Pony Package. Race Red.3:31 automatic.BBK longtubes and catted X.FRPP Sport axlebacks. BBK throttle body. Dynotech DS. Brembo wheels and tires. Strut tower brace. Airraid CAI. Bama tuned.