Fabspeed Porsche 996 GT3 Sport Cat X-Pipe (1999-2005) - FS.POR.996GT3.SCX CSF Supra A90/A91 High-Performance Heat Exchanger We chose high-flow catalytic converters

We chose high-flow catalytic converters of an appropriate size to encourage maximum power gains

For use with or without Engine Appearance Package (ZZ3)

and power for your McLaren — all without check engine lights or noxious fumes

Very simple installation & removal

+ Fits all 981 Porsche GT4 / Boxster Spyder vehicles (2015-2016) with factory or SOUL headers (differences in tolerances from other manufacturers can create issues with over axle pipe clearance)

Fabspeed Porsche 996 GT3 Sport Cat X-Pipe (1999-2005) - FS.POR.996GT3.SCX CSF Supra A90/A91 High-Performance Heat Exchanger We chose high-flow catalytic convertersIncrease horsepower, torque, and sports car sound by replacing the factory catalytic converters with high flowing 200 cell HJS cats. SOUND: Replacing the factory catalytic converters with high flowing cats and our cast X Pipe will provide a mild increase in volume while also revealing a more defined exhaust note. POWER: We saw curve gains as much as 15 whp with this system thanks to much better flowing 200 cell cats and the knife edged cast X Pipe.