Hello from Cold Regina, Saskatchewan: spark plugs, oxygen sensor, intake?

[PoisonIvy]

Hello Regina. I'd get the O2 sensor changed asap. Don't want to kill your catalytic converter if your car is running rich. Run the basic NGK copper/nickel plugs. '09+ Aveos seem to like them best. If you're on your originals with 87,000kms, you should see a nice increase, they were due at 60,000. Super easy to change out (if I recall you need one larger torx bit).

I personally wouldn't do any air intake. At least it wouldn't be very high on my priority list. I've had them on a couple of my Mustangs before. I don't think you'll see much in terms of performance.