Exhaust Muffler System Porsche 981 Cayman, Boxster, GT4


Agency Power

AGP AP-981-170


Agency Power has become well known for their high quality exhaust systems. The Porsche 981 Boxster was released in the summer of 2012 with a total redesign from the previous 987 chassis design. The direct fuel injection Porsche which is available in either the 2. 7L or 3. 4L engine, lacks the sports car grunt. To meet regulations and sound restrictions, the factory exhaust does rob alittle power and performance which can easily be uncorked. The new Agency Power exhaust system for the Porsche 981 is a complete header back kit. It features secondary cat bypass pipes and a dual muffler with a large dual tip. With an all stainless steel construction featuring exquisite TIG welding and polished piping, the exhaust system including mounting bracket is a direct replacement for the OEM unit. As tested on our Mustang all wheel drive dyno, the muffler in comparison to stock added a peak of 7whp and 11ft per lbs of torque over stock. Because of the sensitivity of the traction control, the car must be tested in AWD mode which typically yields lower numbers then a RWD test only. However the most impressive gains were between 2500 and 4300 rpm's which are typical driving conditions to get you from 0-60 much quicker. The exhaust has a more aggressive tone then stock but is still very comfortable for daily use. It is designed to fit the 2012 and up Porsche 981 Boxster and Cayman. It will fit both the S, non S, and GT4 versions. No cutting or welding required. Optional headers sold seperately.

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.