2009 corolla s

Hello, I have recently purchased a 2009 corolla S with 120k miles and so far I am loving it. I’d really like to make this car something more in terms of performance, but I have no idea where to start. Any ideas?

I bought a 2009 Toyota Corolla S from Carmax about 4 months ago. It's got about 83,000 miles on it now and just started making a bad metal vibration sound when I accelerate. I thought it could be the heat shield but two separate mechanics, including a Toyota dealership, have told me that the cat...