SL/R230: Best Aftermarket Exhaust
Chop off your resonators and either gut them, or replace them with straight pipes. That'll give you a quiet-ish grumble at idle and open up your car at full throttle.
If you don't like it, then you can spring for Eisenmann exhaust. How much are you doing to spend with Eisenmann. From EuroteckMotorsports it'll be a little under 2000$. Spend another 200$ (max) on getting the resonators chopped and replaced is just a drop in the bucket. Besides, you already bought a SL, it's not like you have a financial situation where 200$ will make or break you

Plus it's easy for any muffler shop to do and it's really cheap compared to buying a full-blown name brand exhaust.






