Borla. I love mine, the deep tone just can't be beat. I have the true Borla version (not Trubenz) that has the resonator and muffler. My only complaint is that I'd like it to be just a bit louder, so I might go HFC or ORP eventually.
Mine: 2006 Mazda3 s GT Hatch: 115k, Gray, Manual
Gone: 2002 SVT, #1654
Hers: 2012 Focus Ti Sedan: 55k, SGM, Manual