Toyota Celica GT MagnaFlow Catback Get ready to trick out your Celica with a system that kicks. MagnaFlow's Celica system has a great performance tone and a set-of-the-pants performance kick. You'll definitely feel the difference that comes from 2.25" fast-flowing manderl-bent stainless steel tubing, a straight-through MagnaFlow Wide Open Performance Muffler and 4"polished stainless steel tip. Take your Celica enjoyment to the next level with an additional 6.4 horsepower.