Yiannis,
I had the track version of Jim's exhaust on my car in 2018. Was louder than standard, but simply not loud enough for what I wanted, hence the change to the 380/410 exhaust. I think the car would have made it on a loud day, but to be honest, if you want noise, then Jim's road exhaust is far better sounding, but you won't get on at most tracks. Alastair has Jim's road exhaust, so you know what that sounds like.
If you want to do track days, then perhaps best to stick with the current standard exhaust. Other option is to fit a 380 exhaust, with link pipe from Jim, and then add some removable baffles. there's a guy on here who lives local to me who has done this on his 410. Maidstone Sports Cars helped him sort out the baffles, which are easily removed, so now he can do Goodwood, take the baffles off, and enjoy the unadulterated noise of the V6 on the way home:)