Krastorio 2 is the recommended overhaul mod after a vanilla playthrough. It makes the game somewhat harder than vanilla, although I don't really know what it contains as I never played through it.
Industrial Revolution 3 is another good choice.
Or you can jump off the deep end like me and start a Angels+Bobs map, but this is quite difficult dealing with many byproducts and thousands of recipies. Also, you don't need many trains to beat it, I beat the modpack with 3 train lines, but if you want to scale up trains would be useful.
Not all ICE motorcycles are like that. Some people straight pipe their motorcycle to make it obnoxiously loud. But my Suzuki GZ250 is fairly quiet, even at full throttle at 8000rpm you couldn't hear it from a block away