this is my first thread post so if it doesnt belong here please move. so everyone has been asking what is the weak link in the mazdaspeed6 driveline. yea its the rear diff. i have read in another thread that some guy had a prob and he went to the dealer and they said he differential had shifted and he broke a bunch of stuff. well my 4WD light came on at the same time as the CEL. just found out yesterday that it was b/c my rear diff. lets see the clutches were burned up, i melted an electrial wire connector, and a seal was broken in half. the mechanic said it had to of been from racing. but thank god im cool with my service writer. the mechanic said if it was anyone else he would not warranty it and tell the service manager not to warranty it, but since its me im getting it warrantied. so FYI, WATCH OUT FOR THE REAR DIFF IF YOU ARE GOING TO THE TRACK A LOT!! ill get pics up ASAP