Muffler will not void the warranty and a cat back is extra money just to be able to bolt it on and off yourself - sound and performance are essentially the same. To cut and weld in a new muffler is around $40 and takes any muffler shop maybe 20 minutes. Mufflers are in stock wne you are ready. There really isn’t much else you can do except run max air pressure in your tires and all synthetic fluids.
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