I did some warm up testing with my Paseo. I wasn't overly impressed by using exhaust heat to warm up intake air.
http://ecomodder.com/forum/showthrea...-up-11471.html
I also did this testing earlier in the thread if you didn't read it. It took 4 minutes of idling for the coolant temp to exceed the intake temp. On the road this would surely be less, but its not real promising for KISS type setup.