The Relentless Cops mod is capable of making the Challenge Series generally require luck to beat, don't they? That's when vehicles more suitable for being slammed into can be of help! The Bronze levels will give you relatively heavy vehicles, then you get something lighter on Silver... followed by having to work things out in actual cars that aren't the Speed Test version of the Audi R8.
This makes it good, Because the challenge series on this game is completely Unbalanced(Especially the one on highway battle silver, where the car is only 312 km/h, but the AI car is significantly faster) Compared to NFSMW/Carbon.