Your story is right and justified. I have an 1988 supra turbo with 288whp and my bro has a 1998 m3 with 235whp. I can just edge him out. Don't forget the m3 weighs less and it head flow mega air (almost 2j airflow) high rpm vanos cams. you'll get him one day..
Here is the good thing our cars are...
have you done any work recently before this happened?
Try checking for an unmetered air leak (after the air flow meter). This happened to me before, my plastic canister in the air pipe melted do to exhaust temp and my ignorance removing the heat shields .
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