You need to concnetrate on a few things: Blocking off the Blowoff on the intake, search for broom stick Mod
Next is to adjust the Wastegate by either cutting and crushing the wastegate line and control how much boost with your foot. Or splice a control valve and run either stock or full boost or in between.
Run straight pipe by removing your muffler, Turbo is a nice silencer, lol I love I tractor sound but anyways but it's not crazy loud like the cummins diesels.
For Fueling either turn up the max fuel pin, until you see some darkness is spreading out the tail pipe (this is the fun power mode)
Or do the Govenor mod which helps every where on the power band, including just crusing or take off.
GET and EGT Gauge, if your funding a G60 you prob know why it's important to keep EGT's in check, this is espeically true on Diesels, because they are controlled by the input of fuel from the IP, and too much fuel means hot ass pistons and Turbo Fins ( IE grenade of turbo and then the motor)
Other than that you may have more fun with you diesel than you G60 based on the cheap mods and tricks to get her going quick.......