Welcome to the forum. Don't know your level of experience but generally I never recommend buying used unless your an experienced rc enthusiast and know what to look for. Lots of U-tube vids out there to educate yourself on maintenance. Agree with blaster on running it as is and see what happens. Many upgrades are overrated, unnecessary and for bling . Just my experience. Have fun!
I’d do the foam mod on the body post buffers. I used cut up pieces of a pool noodle, but any dense foam will work. The body mounts were the only real problem area on mine. That, and the cracks on the back corners of the body. Gorilla tape!