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This Catbypass Pipes is brought to you by FabSpeed for your Porsche. All 997 Products 2005+ +12 HP +12.5 Lbs of Torque. Saves 25lbs from the rear end of the car. Perfect for racing and maximum power. Much better throttle response and more aggressive sports car sound. Used by many Rolex Grand Am Cup racing teams and PCA/POC/ DE racers. Easy on & Easy off installation and installation hardware included. FOR OFF-ROAD USE ONLY!" CEL may come on but car will run great.