Why? somethings are rough, like the turbo, but they might be fixed later. Its at least not that bad. its only one of @BarmyPark 's earlier mods, so its actually not that bad. Also, welcome to the Forums!
"one of his earlier mods"? He posted this under a week ago... And knowing BarmyPark, he's never going to fix that turbo.
I Meant like earlier as in he isn't very experienced as a modder, not that he posted the mod along time ago.