Actually, vibration is one of the main culprits of added noise created by diesel engines so it's a good place to start (checking your exhaust and adding more flexi pipes or resonator). Try to run it up on a lifter and observe as well.
What tires are you running on now? Crazy 1st-2nd gear wheel spin there.
Those JDM vans are quite fast buggers when i encounter them on NLEX. They can run real hard all the way to around 160kph (i guess after that the drag and vehicle height comes into play more).








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