Ok lets say you have a 1jzgte everything stock, with stock ecu and your trying to make 700 HP. I know the obvious upgrades you have to do to the engine to increase HP, but how do you know what size cam, injectors, turbo, bov, wastegate, and intercooler to use. What about the ecu, how do you know how big you can go and keep the stock ecu, or use a piggy back system. Im just curious of how you make the parts work together and also if you get an AEM engine management control how hard is it to set the fuel map, ignition map, and all other parameters to make the engine preform at its top level.