its also important to remember that peak horsepower is not the most important factor unless your just bragging. i come from turbo cars and there are some things ive found that you guys may or may not know. first, be more interested in having the right trim setup for your turbo so you get more power throughout the rpms, anyone can spike 400hp but can you do it fro more than 300 rpm. second, dual ball bearing turbos have there advantages but for most people standard bearing turbos are more affordable, more rebuildable and have many more customizing options. im not an authority on how bikes get the oil to and more importantly from the turbos so that could change my point. ninja eater and other turbo guys can help with that. ninja, what tubro and trim package(compressor, turbine housings and wheels are you running?unless its secret