A full Ti system for a bike is around 2000$ to 4000$ from Akrapovic, expect much more than that for automotive.I would love an off the shelf, bolt in Ti exhaust option. Ti tubing will cost ~$4/inch, plus hardware, flanges, muffler, and fabrication work. It shouldn't be out of this world expensive.
Akrapovic is the pinnacle, and Ti on a bike seems overkill unless racing. I do wonder if the weight savings on a car would be worth the expense. I do know that the full exhaust on my 11 is likely 20ish pounds lighter just by ridding the car of it's oem muffler and resonator and header, and it was 1400$. How much more weight would be shed going Ti?Akrapovic is crazy expensive, which comes with the territory when you specialize in porsche and Ferrari parts. Raw materials for a titanium exhaust should run $6-700, and forming a custom exhaust system isn't that difficult for a decent shop. Just make sure you find somebody comfortable welding titanium. $2-4k for an exhaust is ridiculous.