cat

My 2014 Corolla S has a borla muffler on it and I have been wanting to remove the cat n resonator to get a little bit different tone, will I throw a check engine light? N if so how can I get about not having a check engine light for it?

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...