This engine name-coded P60B40 featured an aluminum block and aluminum head, dual overhead camshaft, and 4 valves per cylinder. The newly developed engine that replaced the E46 M3 inline-six was a short-stroke V8. Related: This Is Why The BMW 3 Series Is Still the Benchmark Premium Sport Sedan Only 10 M3 GTR were built as the new rules made it impossible to build the car in the 12-month production schedule, but the M3 GTR remains one of the rarest BMWs of all time. This is when the Automobil Club de l’Ouest (A.C.O.), which also organizes the Le Mans 24 Hours decided to put BMW into reconstructing their M3 GTR by adding 100 lbs of weight and 20% larger air restrictors and build 1,000 road-going vehicles. The car was too powerful and Porsche had to claim BMW was stretching things too far and make the competition unfair. The updated M3 got some serious upgrades in the powertrain and deleted some features killing the daily driving conformities. This is when BMW entered the race-tweaked version of an already race-tweaked car. The already powerful 6-cylinder engine featured on the M3 couldn’t hold up as it was built as a road-going model and it lacked the boost to succeed in Florida. Back in the year 2000, when the BMW E46 M3 didn’t make the cut in the 12 hours of Sebring in Florida, BMW knew it had to go bigger and better.
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