I have recently purchased a 2005 passat sedan gls TDI PD 2.0 the 134 horse deisel motor. can this be chipped or do you remap the ecu. if either is possible is it best to get and install a boost valve first? looking to keep the motor close to stock minus the chipping and/or boost valve i'm not looking to rework the motor or to make it a weekend racer this is my daily driver, just looking to sport it up a bit 