Hiya Hajo!
Yup. Wheels has some great sounds collected. I've used Citabrias P-38 sounds, Fscotts, Flakbait, Mitsus' and many others along the way. The OEM sounds are just "ok" but HTC obviously intende them to be one thing the player can mess with. These after market sounds are awesome. Best sounds I've ever had in an online game to listen to.
Nothing like hearing the throaty roar of the two Allisons on the P-38. Or the sound of the powerful, bassey P&W monster on the P-47. Heck my 109 sounds give me a woody when flying that too

I can't help but think of the wimpy Maytag washermachine sounds one would hear in another game long ago. Online sims have come far to say the least!
Westy