Safe to drive without exhaust pipe?

[kcackler]

So here's the story...Was driving along and had the muffler drop out on me. Ordered a new set of mufflers and pipes for the truck to do it myself. Did the driver's side just fine, but after I got the passenger side off, I realized that the passenger side new pipe doesn't fit because the passenger side exhaust manifold isn't the one originally from the truck.

So basically I've got driver's side pipe right now, but just the exhaust manifold on the passenger side. I won't have enough cash for a couple of weeks to have a muffler shop weld up something custom for me, so in the mean time, is it safe to drive short distances without any pipe or will it burn up the valves or something if I go without?

If it's not safe to do daily trips in, is it safe enough to drive it 3 miles to the muffler shop in a couple of weeks? Just don't want to hurt anything.