The Line Praying...thank you for providing us with the direct port nitrous injection, 4 core intercooler, ball bearing turbos, and um... titanium valve springs.
The Truth Titanium does have uses in the valve train. It is VERY strong, and has been used for valve retainers and valve spring caps. However strong it is, it is also very brittle. Anyone who knows what a spring of ANY type does, should realize that the last quality you want in the spring is it being brittle. For those who don't understand why Titanium would NOT make a good spring, here is the definition of Brittle:
brittle (adj) 1: having little elasticity; hence easily cracked or fractured or snapped;
As you can see, the very essence of a spring is it's ability to absorb and store potential energy. Springs can not be easily cracked, because the nature of a spring is very high levels of elasticity(springiness). So, you can plainly see, titanium will never make a valve spring.