can U flat tow the 2003 Evo?

That's a good question. I don't really know the answer. I believe the problem is with 2-wheel towing. The viscous coupling overheats trying to supply traction to the other set of wheels. I'm not sure if all the wheels are on the ground....I would seem safe, IMHO.

FYI, I believe most 4X4 vehicles with manual tranny can be flat towed, e.g. a Jeep Wrangler, Chevy pickup, and certainly manual transmission VW Rabbits, Honda civics, and Didge Neons. Even some vehicles with automatic transmission, e.g. Saturn passenger cars, can be flat towed. I'm told it's because the Saturn's tranny uses a manual lubrication system which pumps when the wheels turn even if the engine is not running.

I guess one of the my questions is how much reliance does the Evo's 4WD system have on the hydraulics which are only pumping when the engine runs? Does anyone know about the Evo's 4WD system?

Good question. The EVO manual specifically states that the vehicle should not be towed. It said the vehicle has to be loaded on a truck if it needs towing and gave a picture of a vehicle loaded on a flatbed towing truck for those who may not understand.

As for does it void the warranty question. If you did something you were not suppose to do and because of your action, it caused the damage then the repair of the damage would not be covered under warranty. The warranty for everything else would remain in affect.

Keep in mind that the Wrangler's are so popular because you can shift the transfer case into neutral and totally disengage the driveline. Also, it's one of the few that doesn't require the engine to turn to keep the tranny lubricated. I will check the manuals and the shop on Monday about towing the Evo but I am guessing that it's probably not a good idea. There are a few other components in that driveline that will not be getting the oil/transmission fluid pressures unless that engine is running.