emissary

I recently purchased an awesome 964 with a 3.8 conversion from a fellow Rennlister. The car is great, but it's a bit too quiet for my taste. The car currently has a primary bypass (cup pipe?) with the stock muffler. As part of backdating the car, I plan to move to an M&K MKM34S exhaust with center dual outlets. Is there anything else I can do to the exhaust system to boost the sound volume without sacrificing low-end torque? If I were to add headers or a secondary bypass (G-pipe?) for the sound, any ideas what percentage of torque I would lose at the low end? Thanks in advance!

Goughary

Engine sound outside or inside the car? Take out the engine sound deadening material from the engine bay and the rear shelf....

Although. More noise is just going to hurt...lol

apanossi

Someone on Rennlist once posted on this with dyno results. The primary muffler has the greatest restriction to airflow. With that said, I bypassed my cat and secondary along with an adjusted Steve Wong chip, and the damn thing is LOUD! I love it. I loved it so much that I got rid of my engine and rear shelf pads as Goughary explained. Not everyone's cup of tea.

JasonAndreas

If you are going to backdate then forget about aftermarket and use the center muffler from the 997-GT3.