Quote:
Originally Posted by chanomatik
I would think that it has more to do with the tS being more "track ready", purposed for hanging out at high RPMs all day. Therefore it would stand to reason that having a driveshaft that can hangout at the higher RPMs for prolonged use for a car made for more specific purposes would benefit greatly over a stock driveshaft.
Same reason why the tS gets Brembo brakes. Bigger brakes have less brake fade over the course of a track day. Subaru/STI felt the 4-pot/2-pot Brembos were adequate and significant enough of an improvement over the stock floating calipers.
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If the RPM limit has not changed, then the stock drive shaft should not reach critical speed. Even at any length of time at RPM, if the drive shaft doesn't reach critical speed it will not fail due to critical speed.
I am not saying that the one piece driveshaft isn't performance intended, I'm just saying if the larger diameter only modifies critical speed, then the larger diameter drive shaft is not needed.
Not saying a lighter one piece drive shat isn't needed. Just a larger diameter isn't needed.