Just wondering for the final car builder will you be able to attach different exhaust systems produce different sounds. Perhaps a slider or two for exhaust note tuning, I really have no idea what would be involved with implementing this or how hard your sound system is to adjust so this might be a horrible suggestion.
You already choose the exhaust setup in the engine builder…not sure what a “slider” would change. Maybe exhaust tip size or location like half-pipes vs full-exhausts?
Still I don’t see what value this would add to the game to justify the costs and time of actually implementing it.
If they had an unlimited budget and a larger team then I’m sure it would be something they would do.
It already changes the engine sound in the engine designer on the basis of exhaust configuration, intake type, engine layout, cam profile, fuel mixture, turbo size/rpm/boost 
it sure does because if you put race everything onto like an I4 you can really hear the turbo and it through the exhaust the acoustics Daffy are awesome in my 7.1 surround sound headset although you need to make sure it comes in balanced because it comes in my left ear then my right and its only on a few points around the engine I get to hear the car fully in both ears…so an Audio bug to be fixed
I meant more on the lines of catback, resonators, multiple exits that sort of thing
Maybe that’s what surround sound means. Let the engine run and move around the engine. Notice something?
I’m not sure what you mean by Catback, that just refers to an aftermarket exhaust that replaces everything behind the cat (piping and mufflers), so in the context of designing a car I don’t really get it 
Resonators possibly, we did intend to have those in the engine designer, but never ended up happening.
Multiple exits won’t really change the sound meaningfully, although there probably will be some cosmetic choices as to what the exhaust tips look like and where they sit, as its a major styling feature on some cars.
A friend of mine has a old Volvo 444, that he and his brother modified.
The engine is a small I4 pushrod 1.4 or 1.6 liter.
But I have no idea what they managed with the exhaust system, it has dual outlets, one on each side,
but at idle you could swear that it was powered by a v8 engine. Same type of rumbling idle sound.
So different types of exhausts could be fun, but maybe as a dlc later on.
probably removal of both silencers…
I Think the sounds must change, a 5.4 Engine 4 cyl, cant sound like a 400CC engine, even if both are at 9000 RPM…
Alright, we’ll change that if you pay us the costs for that, which would be around $80000.
This is a 3.4-liter crossplane V8:
This is a 9.4-liter crossplane V8:
They sound similar enough to me! I don’t think it’s worth the cost, as Killrob mentioned, to have sound that varies with engine size. As long as it’s recognizable as a certain type of engine, that’s all that counts.
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[quote=“Slim Jim”]This is a 3.4-liter crossplane V8:
This is a 9.4-liter crossplane V8:
They sound similar enough to me! I don’t think it’s worth the cost, as Killrob mentioned, to have sound that varies with engine size. As long as it’s recognizable as a certain type of engine, that’s all that counts.[/quote]
-KLAXONS GO OFF- ENGINE NOISE EARGASM ALERT 
Sounds in general are very important to this game IMO. Much better sounds and more samples are needed. Again, just my opinion.
P.S. Love the concept of this game. It’s quite unique and very interesting.
How do you propose we improve them though, that’s the point. We’re already paying pretty much the most experienced experts in generating engine sounds. There is no way we can possibly afford to record real engines for everything, so that option is off the cards.
It’s easy to say we need “much better sounds” and I agree that I wish they did sound a bit better, but I honestly don’t know what more we can do at this point to improve them with the technology and money we have available to us.
I think right now the exhaust diameter doesn’t change the sound of the engine. Also, there’s no difference in how i set the engine up, cause i made 2 1.5L I4s, one tuned to be used everyday and one to be fast, then just to try out i revved them both to 7500RPM and they sounded exactly the same, even though they have completely different set-ups.
Ahh, ok, yes that makes more sense, there are some issues with how the exhaust diameter effects the sound I’ll check but I think its only the number and type of mufflers that change it currently, but they do change it a LOT. That should also be tied into exhaust diameter too, but I don’t think it currently is.
At the moment will be differences in engine sound with how cammy it is, if it has VVT or not, what mufflers is has and how open the intake is.
I notice a difference in the intake, exhaust mufflers and engine configuration. However can hear no difference with a different exhaust manifold, cam profile or fuel mixture. Also, the bypass valves doesn’t affect the sound through the rev range, mufflers or not. Still very accurate sounds though, but just needs a few tweaks. 
Exhaust manifold doesn’t have any effect currently. Cam profile has a huge effect on idle sound and a mild effect on sounds at higher revs. Bypass valves should make it suddenly get louder and angrier as at passes 4000rpm.
Fuel mixture makes it pop and bang if you run it way to rich, but besides that I’ve never heard a real engine sound any different at different fuel mixtures in real life, even when tuning an ecu.
have to agree with Daffy on fuel mixture, popping depends more on cam profile, valve lift duration and the exhaust manifold
speaking of sound itself, under-square, square and over-square engines make different sounds
for a good compramision BMW’s S50B30, S50B32 (BMW E36 M3) and S52B32 (BMW E46 M3)
and listen to Mercedes Benz M104 (300E-24) and Toyota 2JZ (most notable use - Supra)