Yes I see I think it's all depends all goals ect... Seems like a A12/A15 motor is easier to do and manage also cheaper but u will hit a wall with performance ... While the SR20 will require more know how and money but will end up in a better power to weight ratio... If my car came with a motor and tranny I would just stick with the A12 but I rather save up and just put down the 6k or so maybe more for the SR20 swap from the beginning... The info has been great thank u for the help