Shellback---I recently purchased a high flow performance muffler/resonator combination from
www.solo-performance.com, as differentiated from solo performance specialities. got very good service from jeff boychuk. they sell systems with a range of loudness----I got the "quantum" muffler/resonator, which still has a modest level of note while cruising----about the same as a supersprint muffler that I had. they also have another level called "stealth" that should be fairly quiet. the quality seems very good, and there are a variety of sizes that will easily fit the ti, and mine is also lowered with the e30 differential. the prices were quite reasonable, especially compared to the system you found on ebay. the muffler shop I used charged only $100 for the installation, and it is perfect fit.