This BORLA Cat-Backâ„¢ system is specifically tuned for performance and sound on the GR Supra's 3.0L twin-scroll turbocharged inline six engine. Our system is designed to be drone-free so you can get the head-turning sound of the ATAK and still enjoy a comfortable sound inside the vehicle during cruise. The system includes our Polyphonic Harmonizer technology which utilizes patented units that contain pipes of different diameters and lengths to create multiple exhaust notes that harmonize to deliver a clean rich full-bodied sound to the BORLA mufflers. The mufflers then enhance this sound to the character and volume appropriate for this aggressive ATAK system. The system also has a functioning valve that works with the factory actuator to change the exhaust volume. This Cat-Backâ„¢ system features a 3.5" pipe diameter that splits into dual 3" and comes with single 4.5" round bright chrome on T-304 stainless steel tips on each tail pipe to complete the look of the exhaust. Systems with black chrome on T-304 stainless seel tips and carbon fiber tips are also available. Ultra-smooth mandrel bends ensure maximum flow & power and precision computer numerical control (CNC) manufacturing ensures an accurate fit. As with all BORLA products it is constructed using T-304 stainless steel for increased durability. This is backed by our Million Mile Warranty. Bolt-on a BORLA and give your Supra the power and sound it deserves.