Interpreting "small" as ~$250 or less.
1.) Badges: FiST hack (see profile pic), Octane Academy, Mountune
2.) Mud Flaps (Rally Armor)
3.) Chin spoiler (Mountune UK)
4.) Diffuser fins (Velossatec)
5.) All weather mats (ST)
6.) Carbon shift knob (ST)
7.) Stubby antenna (Whoosh)
8.) Sequential led mirror/turns (Whoosh)--best value mod imo at $35
9.) Led yellow fogs (DD/Whoosh)
10.) Spec D tails (Whoosh)
11.) Black gel Ford emblem overlays (Whoosh)
12.) "FISTY" vanity plates (Ohio BMV)
I feel each of these in my butt dyno... even more when I'm wearing my ST Octane or Whoosh t-shirts. 🤣