I have a maxogen on my 200,
it sounds sheer awesome, there is the low down rumble (closest thing i cam describe it to is a subaru) when your tourqieing it in the low down revs,
mid range it's very growly makes the car sound more powerful and enthusiastic
top end it sounds like it is building up "boost" pressure as there is a hiss along with what I can only describe as one of the best noises I've ever heard, the induction roar is just unreal
And when your in Eco mode you will never even know it is fitted very quite and civilised