The best replacement for dirt 2 is grid.

The best alternatives to dirt 2 are rated as following:
★★★★★  grid
★★★  dirt 3
★★★  dirt
★★★  forza 3
★★★  nfs shift
★★  need for speed shift
★★  dirt showdown
★  burnout paradise
★  dirt 1
★  motorstorm pacific rift
★  wrc
  motorstorm
  rbr
  forza motorsport 3

Your alternative for dirt 2 is not listed? Suggest!
Speaking about dirt 2, one probably shouldn't forget about great honor.

Other search terms related to dirt 2 and their ratings are:
★★★★★ great honor
★★★★ dfgt
★★ great honor achievement
You have in mind a companion for dirt 2 and it is not yet here? Propose!



Google Trends

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dirt 2
grid
dirt 3