I have the Mugen twinloop exhaust. No titanium muffer btw. Overall its a great exhaust, sounds fantastic and perfect fit. Its quiet around town but sounds very unique in the upper rpms, especially when its warmed up. The only downsides are the piping is only about 2" from where the cat meets the exhaust flange, but then increases after the first resonator it to 2.36". Other unrestricted exhausts will probably outperform the Mugen, and the price is a bit steep, but you get what you pay for.