| Rank | Board name and description | Posts | Members |
| 1 | VW vortex forums Volkswagen and related car brands discussion boards | 57100553 | 492548 |
| 2 | Honda tech Honda cars enthusiasts forums | 34644340 | 297178 |
| 3 | NASIOC Forums Forums of the North American Subaru Impreza Owners Club | 27726788 | 219369 |
| 4 | Bimmerforums BMW car brand message boards | 17198632 | 243418 |
| 5 | E46 fanatics BMW 3-series owners community | 10621323 | 152354 |
| 6 | Houston imports Houston import race scene forums | 9871661 | 45361 |
| 7 | Pirate 4x4 4x4 message boards | 9114916 | 145680 |
| 8 | Montreal racing Car racing in Quebec (in french and english) message boards | 6204710 | 57062 |
| 9 | Mustang world Ford Mustang fanatics message boards | 5645955 | 48031 |
| 10 | VA Driven Virginia automotive ethusiast forum | 5626437 | 42266 |
| 11 | Tampa Racing Car racing community | 5356958 | 71948 |
| 12 | 3SI Mitsubishi 3000GT/Stealth forums | 5101480 | 30363 |
| 13 | DFWstangs Ford Mustand discussion forums | 5090127 | 36633 |
| 14 | Maxima.org Nissan maxima fanatics forums | 4973706 | 81360 |
| 15 | SXOC Nissan 200SX owners club forums | 4881694 | 22154 |
| 16 | Bimmerfest BMW owners community | 4533556 | 172631 |
| 17 | Jeepsunlimited.com Forums Discussion and marketplace about Jeeps | 4101057 | 102816 |
| 18 | 3.8 mustang Ford mustang owners community | 4039755 | 22969 |
| 19 | Super Honda Honda owners community | 4035644 | 149295 |
| 20 | MIGWeb Vauxhall - Opel message boards | 3970852 | 48402 |
| 21 | Honda-Acura.net Honda cars message boards | 3862590 | 104006 |
| 22 | BARF Bay Area Riders Forum | 3274696 | 22566 |
| 23 | TDI Club VW TDI engine message boards | 2710537 | 70555 |
| 24 | SG House Singapore property and rental forum | 2636994 | 31938 |
| 25 | Club WRX Subaru Impreza owners community | 2249922 | 60097 |
| 26 | Great Lakes 4x4 4x4 message board | 1852849 | 12695 |
| 27 | DTM Power BMW tuning forums | 1578729 | 68549 |
| 28 | Acura world Honda Acura forums | 1503798 | 43784 |
| 29 | Honda Society Honda owners community | 1457604 | 13928 |
| 30 | Club Grand Prix Pontiac grand prix discussion forums | 1384425 | 14900 |
| 31 | Fiesta Turbo Ford Fiesta tuning message boards | 1370289 | 10631 |
| 32 | Forums Hawaii Hawaiian automotive community | 1016911 | 27775 |
| 33 | Club GTI GTI cars discussion forum | 952547 | 9878 |
| 34 | SLUniverse Second Life forums | 807398 | 8607 |
| 35 | Lille Hardware Computer hardware community | 750996 | 5080 |
| 36 | Airstream Forums Airstream caravane owners community | 749182 | 37600 |
| 37 | ClemsonTalk Clemson University forums | 704006 | 2957 |
| 38 | Cars message board | 247398 | 987 |