Aftermarket exhaust systems

Does anyone have any recommendations?<br>
<br>
Anyone actually done this and noticed a performance difference?

<br> only. Which mean you have to drive your car hard up to redline to be able to feel it. I install the AMG exhaust in my SLK 230 'sport', couldn't feel a thing but it look great and sound it wonderful.

...But i heard that certain companies like lorinser claims 10% horsepower increase...so am I mistaken?...thanks in advance