I have seen people doing some upgrading on their tb like reboring it to bigger size for example from 60mm to 65mm...some even change the inlet manifold to a bigger one for example using the tep r inlet manifol as a substitute to stock b16a one...does this procedure improve performance of the car?in wat sense, pick up, trottle response, etc? If it does, how much hp and torque can this procedure help u to gain hp? Can this be done on a stock b16a or u have to upgrade other things such as cams, pistons, etc?