The 2.9's are solid blowers. It will be hard to say what upgrades you would need because theres no telling whats on the vehicle.
But for the 2.9's a good building spot would be getting the VMP Dual Pass Heat Exchanger with fans, if it doesnt have them.
Power modifications I would say 1000cc...
I'm late to the party, but feel free to reach out if you need anything done still.
I'm all the way down in Buda, but just giving you the option.
Minor or Major stuff, as well as custom tunes.
Ryan