Freedom Motors has developed an inexpensive alternative to expensive aftermarket exhaust systems for your 1999-2004 Porsche 911. We take your O.E.M. factory exhaust and modify it to flow just like an aftermarket exhaust. You will get increased performance and a superior sounding system. This is the way your 99-04 Porsche 911 should have sounded from the factory: A deep throaty rumble at idle to a powerful but distinctive roar when the motor hits the upper power band. Noticeable increases in HP and torque can be felt everywhere, but the low end torque is most improved. Around town at lower rpm the increase in torque over the stock system is very noticeable. Priced at less than half of comparable aftermarket exhaust systems, it's a sure bet.