With the muffler please choose additonal one of the mandatory needed 2 link pipes (with or without catalytic converter) or the Evolution header.
EC type-approval is valid only when link pipe with catalytic converter is installed.
It's not just about peak power--Akrapovic exhaust systems deliver increased performance throughout the entire rpm range. Increased power and torque result in a much smoother ride. All Akrapovic exhaust system measurements are made on our computer-controlled chassis dynamometers.