a good aftermarket muffler/cat back exhaust?
If you plan to add LTH. A good catback is recommended. Do you know Eisenmann makes the OE exhaust on Many AMG models? Including the Tips for the C63.
I have had experience with the Akra / Eisenmann and stock setup. Anyone who tells you a solid aftermarket Catback is not worth it, in conjunction with LTH are crazy.
The stock catback is raspy with LTH's. Even with Secondaries + Resonators deleted. The sound is uncontrolled / less refined. Add a solid catback and it sounds extremely controlled and beastly. A good after market cat back allows for higher flow.
I say go with the LTH setup first. If its too much, swap out your catback for a good aftermarket one. You will benefit from the gains of the LTH's.
I personally don't like it super loud. I prefer a more refined sound. I have the Eisenmann race setup and will be adding LTH's in the near future.






