2003 Toyota Matrix / Pontiac Vibe MagnaFlow Catback The new generation Toyota is a pretty cool ride to begin with. Don't let that stop you from tweaking it a little more. MagnaFlow's Matrix system squeezes extra juice from the 1.8L engine by opening up the exhaust and letting it breathe. The system features 2.25" fast-flowing mandrel-bent stainless steel tubing, a Wide Open, straight-through stainless steel MagnaFlow Performance Muffler and a polished 4" stainless steel tip. Go ahead and make Matrix yours.