I'm more of a NongShim fan, but I like these guys too. They have a Korean spicy-
cheese version which is pretty unique. But I'd argue instant ramen generally isn't going to have the gut-igniting degree of freshly prepared spicy dishes, IMO because you're likely going to get customer complaints that something is too hot. In a restaurant they can sufficiently warn you, so there's no excuse.
Which brings me to Japanese Ramen houses. Japanese food generally isn't known for being too spicy (probably because it's ulcer inducing?), but I've been to some ramen houses that have dishes
specifically made to challenge/torture customers. They're the type of dishes that your meal is free if you can completely finish it, and get your picture on the "wall of fame". I just tried a spoonful of the soup and that was enough to numb by tongue for a couple hours. It's funny because when you look at the "wall of fame", most of the people who completed the "challenge" basically have an expression on them that makes them look like they just came back from the Emergency Room... or are on their way there.
Tonight, I did something of a food challenge that I've seen on YouTube. I made 3 bags of Samyang 2X Spicy Hot Chicken Flavor Ramen Noodles. I let my wife and mother-in-law taste them. One bite was enough because their mouths were on fire. I ate the rest so I put away almost 3 bags. I thought they were spicy but I was expecting them to be spicier. They were good though. Anyone curious about these noodles should try them.