u/Entire-Somewhere-819

Hello everyone!
I was thinking about getting a new exhaust system for my Aprilia RS660.
I love the sound when you rev up the RS660, but the „normal“ sound (e.g. driving in constant speed or the stationary sound) could be better.
Can you guys recommend any other exhaust systems than the stock one? And are they worth the money/is it a big difference to the stock exhaust?
It has to be legal in Germany (Euro 5), so with db and kat if needed.
Thanks in advance!