Quick scenario

Ok, lets say you own a 99 civic ex, just had catback, headers, intake and rims thrown on. You have about 400 left in your wallet, what do you do next?

p.s. You cant turbo or supercharge it, do a swap, and you cant destroy it or trade it in. ha
-And I know I could search this topic or similar stuff but im curious what people will do now, since new stuff comes out, and opinions change on things ect., thanks.