From the article, it does look like they're selling full titanium exhaust. The article mentioned that its really light so i won't be surprise if its full titanium setup. However, one thing is that we won't know what grade of titanium is it. There are a few grades available in the market, and depending on your application, each has its own characteristics and its own price. I do think that for automotive applications, the grade of titanium are normally comercials ones. That means its the easiest to weld and most commonly found around. The ones that are used in underwater, heat exchanger or aerospace are alot purer and more expensive. Anyways, USD3K for a set of exhaust is really really expensive for an average Malaysian. We've not even put in the workmanship yet.
The main advantage of titanium setup is not the horsepower gain, rather the weight savings. The extra power you feel is most likely due to your car being lighter. If you ask me, a nicely tune up stainless steel exhaust can produce the same horsepower as a titanium exhaust.