I would also go Yashio Factory, iv had good experience with their systems. Full Titanium is a pretty penny for just a pipe, unless you really want to spend that much..you really wont see any more gains than the next 3rd party exhaust system. You can also consider doing a custom job, which is usually the best bang for your buck.
If your looking for quality exhaust systems expect to see numbers around 500-900 USD.