As it’s a diesel you will need an equator (active sound system) if you are seeking a sportie sound. The diesel SQ5 had just such a system fitted as standard and that could be made more intense with an after marked accessory.
You don’t have to spend a shed load of cash to gain what your looking for, if I’m on the right track that is.
https://www.insideperformance.de/en/...d-diesel-1544/