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I did it!
Yes you did Hiro! We all did! Well done goons!
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Mr Gunn, I did it!
Look at Hiro, so proud he has to share his excitement with surrogate father.
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Ooh, well done!
And look at proud Gan San, to whom Hiro is like the Son he'd never had…
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Congratulations, cheers
Oh, right, this guy is also his son. I forgot.
Hey, you're looking remarkably… not dead.
…That's great news!
I guess we can't call you King anymore huh? You know… on account of Hiro being the King now. 
:
This too, thanks to Gunn.
Yes, that's right, King Yoshimasa. Your own father, who disowned you for competing in Zero 4, just helped a stranger defeat you… by helping him compete in Zero4.
You know, the Iwamoto family is pretty messed up…
Oh, our cheery victory music has gone sad all of a sudden!
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Dad… I don’t expect forgiveness… I just want you to understand….
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I wanted to do Zero4.
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Only when I was doing the Zero4 could I feel my heart burning.
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I was called the beetroot tuner.
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I respected my father.
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I was also covered in dust.
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Following in my fathers footsteps, if you do a car shop.
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The shop must have been closed. A safe life would have been delayed…
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But I didn’t want to.
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The seven lights of my mother, the car and the sky…
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those things are not of my own power!
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I wanted to test my strength.
The translation is really spotty here, but I think Yoshimasa is saying he was expected to follow in his father's footsteps and take over the mechanics shop. But instead he wanted to race.
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In the world of Zero4. How much power do you have?
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I wanted to see what I had…
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So I left home.
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If I were with my dad, I’d probably rely on him.
Wow, uh, truly tragic stuff there Yoshi. I don't see why you couldn't, you know, race AND be a mechanic.
...You know, some of us here keep several jobs to fund our habit… at the Arcade… the Economy Centre… not to mention side hustles of betting on street racing and… creative reownershipping of cars.
And where does all that money we earn go? To a mechanic!
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I’m sorry to my mother. I think I did…
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Gunn-san or Kings feelings. I understand that very well.
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I do the same thing, and I care about my mother the most.
Funny Hiro, you’ve never mentioned her before… Or visited her in the four years you’ve been doing this.
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I think it’s King who is in the mix.
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That’s why…
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Noisy!
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Don’t be so nasty! I know that….
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Yoshimasa… What is your mother?
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I shouldn't have said something like this before I died.
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You have your own way to go. Please let me walk….
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When I think about it now, my mother thinks of you the most. I understood it.
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Dad….
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But that old car. Doing Zero4. There’s no way I can do that!
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So until that time came, if you do Zero4, there is no way.
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You don’t even know that. As a tuner. Not yet.
It sounds like Stubborn Gan San might finally be letting go of his resentment.
That, or he's learned nothing from all this. I honestly can't tell.
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Why did King do something like that 20 years ago?
Wait - King Iwamoto said he was 30 years old.
Did he move out / was kicked out at 10? Boy Gan San is a stubborn father.
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Zero to 400 in a car? Were you doing it?
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That Toyota 2000GT. When I was 20 years old, I got it from my dad.
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So in that car, becoming number one in Japan was the first goal. I had decided.
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Actually my dad tuned it. There's nothing else besides the car.
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I’ve never lost.
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Is that so?...
You never lost a race before, eh Yoshi? Well how does it feel NOW?
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Enough talking now. Let’s all become the new Number 1 in Japan. Tell me, and do it!
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Hiro-san, you have become the best in Japan! Because I was the Zero4 King.
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You are… Yes, ZERO4 CHAMP!