Auto Birthday Gift Ideas for boyfriend. Please help!

Don't know anything about cars and would love some help. My budget is under $400. He has a corvette and just bought a lift machine/structure to put in the garage. I don't want to get him a bunch of small stuff. I prefer to just buy one nice thing. He already has a bunch of racing stuff on his car. Are there any cool accessories I can buy for his lift, garage or corvette? Or how about a great gift for a car guy?

Appreciate any help!