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That's the typical 16-valve sound. Any four banger with 16 valves has a certain point where it really starts to growl. Be it bike or car. ;)

Yeah but at least it's a better layout than the D14a4's vertical throttle body haha! Also yes I'm aware of that, they should be alright for 6000/8000 km but I always look at my engine bay so I would see it if it starts flaking! Need to make the tube a little longer and separate the air from the radiator after this. Sound wise it's already a lot better than stock, especially at 4600 rpm... for some reason it changes engine tone quite noticeably there

Clean looking engine bay, I like. But I didn't know that they made plastic intake manifolds for earlier D-Series. Interesting. And just a friendly warning about these HKS-style air filters - they tend to disintegrate and get sucked into the engine!