Header wrap will help some with the engine noise. Adding a simple bullet style muffler should help with the overall growl or swapping for a big body magnaflow. I don't mess around with cats anymore so I won't comment on that portion.

 

Adding a resonator will help tone it down a bit.

 

Thanks guys!! I think I will get some header wrap and see if that helps the cabin noise.

As far as the muffler goes, I might see if my dad wants to swap me his factory exhaust for my Corsa. He has an 09 Chev so it would be easy enough to do. From there, I could probably convince him to buy me the magnaflow muffler you guys are recommending.

 

Following up on this. Did the wrap help? I'm having the same irritation after installing a set of long tubes on my 2014 Silverado 6.2L