This is good, On full throttle I feel that this is an improvement over the stock Kunos sounds. However, off throttle or partial throttle, the engine note has a strange oscilation/distotortion to it that isn't present on the real car, especially in replay cameras when breathing on the throttle pedal lightly (and if it is, it's exagerated in this new sound bank).
From 0:50 to 0:54 in this video (
https://www.youtube.com/watch?v=GCgdfNR9J6w), there is an audio note similar to what you've implemented, but throughtout the video it's isolated to that one snippet, and I think it's a tunnel effect as he's recording from either the bridge looking down towards Ascari Chicane, or from further back at the 2nd Lesmos.
TLDR: I can see it's 0.5, it needs work but not that much. Off throttle sounds a bit wierd and not true to life (atleast in 95% of all circumstances where you would have heard this car)
On a side note, you're other sounds mods are fantastic, the Porsche RSR '17 obviously being your standout work. RE your C7R sound mod, is there any chance you could adapt that to the IER Corvette DP? The original sound shipped leaves a lot to be desired and having been an avid watcher of TUSCC (which is now IMSA) over the past few years, the sound of the Vette DPs is pretty much identical to that of the its GTLM/GTE brother, albeit revving slightly higher i believe (Both engines are Corvette 5.5L NA V8s blocks).
Keep up the good work and I look forward to seeing this mods progress (as I'm sure alot of other people do to). :)