It was about $30.
The factory rubber hoses can crack and break down over time from age and heat - this leads to vacume leaks - so the first benefit is going with Silicone is they will outlast the car.
As far as performence benefits ... well as I understand it the breather tubes feed spent gas from the crank case back into the intake to be reused - so I'm not sure of much gain to be had other then the new tubes being much more efficient.
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