But the original context was actually in list form, part of which was "bang for the buck". The RMS Wilwood kit could easily fall into this category (as it is another massive pile of pure awesome) however it's cost would exclude it from being considered a "bang for the buck" modification by most people.
1989 240SX Fastback. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1995 300ZX Twin Turbo Warning: Objects in mirror aren't as fast as they thought they were.