Yeah, Typically I want a good street sound so I NEVER go past sports exhaust in GT6, and I usually swap out the headers and catalytic converter as well. I think that's realistic tbh, because irl racing exhaust, especially titanium has a pretty distinctive note.....or sound quality, not sure the right term. Just very metallic.
But pretty much every car I buy in GT6 I bring to a track and try out every exhaust combination to find the best combo for each car. I don't recall specifics off the top of my head, but some sound best all stock.
I think GT has pretty accurate "over-TV" sounds. They pretty much sound like they do when I see the cars on TV, recorded by microphones, played back over speakers. Like the GT3-500 cars and sports car racing cars, whenever I actually get to see those races on TV, I think they sound EXACTLY like they do in GT5/6.......which is really no distinctive sound at all from the in car cameras aside from the high pitched whine of a racing transmission, that's all I hear watching those cars race on TV.....which GT seems to have down-pat.
It's just the low-end sounds, and the imperfections of real life GT is missing in it's car sounds. I will always remember one or two patches after GT5 2.0, they changed how the sound files were played back obviously, and everything sounded amazing, deep, dirty and imperfect. Like the 787b literally sounded like the fabric of reality was being torn. I was like yeah, this is what I'm talking about for sound in GT. But in the next update it was gone and never came back.
They need to bring back that mysterious piece of code permanently, though GT6 is slowly getting back there. Car sound in GT6 is WAY better now than it was at launch and it got most of that fairly recently. But still nowhere NEAR where it was in that particular GT5 patch.
The real annoying part for me is that it's obviously something easily changed in the audio playback code. Because you can hear fairly accurate exhaust sound for pretty much every car in the game when you select them from your garage and they start up and sometimes rev-up. Why does it sound so good and accurate in that 1-2 second audio sample, but sound completely different when you actually use the car? It just makes no sense. PD is missing SOMEthing so simple, which they bullseyed once, but then took away in the following patch.
Hmmm, now I wish I submitted that in the ask Kaz forum. I would have liked to ask what was it about that particular GT5 patch that made the sound so amazing, and why didn't they keep it when sound tends to be their fan's biggest complaint?