I'm a Borla fan. The good: easy to install and they last forever. The bad: they're expensive, usually very expensive.
'98 Bright Red GT 278,000 miles and counting...
'02 Galaxy Silver GTP GMPP Suspension, F Body front brakes, TDC FWI intake, Ported M90, Intake, and Throttlebody, Overkill PCM
'02 Bright Red GT