Hello,

as part of my preparation, I seek a titanium exhaust system with the best performance and valves.

Here's what I found:
http://www.kline-innovation.com/ -> sound great, but low gain (10-12 hp) (email with the company)
http://titekusa.com/ -> sound nice, announced gain: 30HP and 22TQ Gain (found on vividracing)
http://www.ipe-f1.com/ -> sound great, I have not found gains announced
http://www.fi-exhaust.com/ -> sound great, gains announced 5-10% (email with the company)
http://www.fluidmotorunion.com/

Thank you very much for your experiences and opinions!