Thanks for your critic, this is exactly what I expect from someone testing a sound.
About the idle echoing it's normal, it's TDU audio engine who does that and I don't know why exactly, nothing I can do about it anyway.
About the lack of sound I don't know, it's ok here (as you can see in the video). Maybe you use it on another slot which has this bug?
This sound is now released here : Released Doctor G - Mazda 787B sound (Mclaren F1 LM slot)
Thanks for commenting. But now this is exactly what I don't need from someone testing a sound... You like it? Fine... But it's not of any use for me to know if you like it or not, I need to know WHY you like it (or not) and what you would change for enhancing it (nothing is perfect, especially that sound who is much too loud, for example).
Reading the 1st post with more attention would have helped.
To the others who recently tried betas and didn't comment here about it, no need to say that it's no use to eventually ask for another one...