Not bad, only suggestion I have is to possibly make the exhaust sound a little more raspy/throaty, but not too much. Here's a video that might help:
Is that changed exhaust? The mod i made is bone stock. --- Post updated --- This is a common problem when recording sound and importing into a video game. It seems the raspiness throatiness gets reduced first before all else but its possible to find different samples which i have. This sound mod uses bmw m3 challenge recordings which is made by bmw themselves and recorded from a european 2007 bmw m3 e92 not 2008 US spec m3 e92 like you are showing above but let me try the forza samples which most likely have the us spec 2007 or 2008 one.
Let me try again the forza 2008 m3 e92 exhaust sounds they are more raspy but still dont have that tin can metal clicking which sounds so nice.