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What kind of changes you have made to the bmw m3? is that most wanted performance? i tried your attributes.bin file..and that is your progress?
the handling you made its similar to beta 2010 nfsw version. you gotta do something to look like nfs world not other games.
293 top speed stock and 378 top with elite parts?
I cant even make donuts
(too much drag in there)
Make me understand what kind of performance are you trying to do?
about corvette z06 still like tank feels(a bit of handling/drifty there) but not big difference.
and z4 stock sounds like pro tuned (nissan nismo or skyline combined with bmwm3 elite parts, tuned)
the z4 changes...are the worst sound i ever heard.(maybe you did nothing to z4...this could be the after effects)
I dont want to be the bad guy here...but if you want to make a real performance here..
try to make it with the physics from the game ,they will be a bit different but at least this is the nfs world physics.