hehe i would love to put SR20DE inside.. but maybe in future.. for now just enjoy the A15+5speed setup... for near future. Wanna change the exaust pipe from std A12 to maybe 2" or 1.75" with 4-1 header, upgrade ignition coil to lucas sport. for the carburettor part maybe i'll stick to the original. twin dellorto would be nice but fuel consumption is my concern.