I really love the way the N55 sounds. But the thing is that based on my research you would have to most likely build the engine past 500whp. I’ve wanted to single turbo an N55 but I’m not sure if the engine can handle it or maybe it’s a matter of how much psi I’m pushing. I could just opt for a N54 as well but I haven’t seen any mint “one owner” options. Two owners would be fine but not any in my area that’s not high mileage or beat to death. I’m currently saving 5K for a down payment on a E90 N55. I prefer the steering feeling and driving experience over the new tech in F30. Would it be more worth it to save an extra 5K for a B58 in that case since I wanna single turbo it. There are very limited stories on built N55 so I thought it would be a very fun project. I also considered DCT swapping a E90 if I got one. I’d love to get a 335is but none in my area. I wanted a big single turbo rated for 650/700hp