This is the CatBack Remus Sportexhaust.
 
Taking out restrictions and leaving a gorgeous note on the throttle and valve control for when you want to go loud.
 
Proven to improve the power and torque and flows so much better than stock with an increased diamter and weight reduction as well.
 
Here is a link to a video of this exhaust in action.
https://youtu.be/1Tf8Ilan07M