How hard is too hard on the engine?

Joel's98GT said:

for not engine braking, it is hard on the clutch and syncros (weak spot in our trannies)

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300bhp/ton said:

engine breaking hard on... WTF are you on man.

There is no way any one can really make serious cross country progress without engine breaking. And the brakes will won't like stopping the heavy Stang so after a mile or two I should think they're spent.

For this reason an automatic car will always have a MASSIVE disadvantage point to point.

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