So, I am buying a 135i M Sport Manual Coupe and the dealer has given me an option to drop in a forged motor or a low milage used stock motor. My question is where to get a forged long block and is it worth is or should I just stick with the stock motor, also note this is going to be my daily and I would like to push around 450whp and am going for reliability. I am new to the N55 world, and need all of the advice I can get. So please share your thoughts on this.