Chips do nothing, might as well put the tornado in the air intake tube.
If you want some gains besides putting a turbo or supercharger on the motor (which I bet wouldn't fit) here is what you can do.
*Cold air intake
*Drop in K & N air filter (even if it does nothing to begin with, a k&N filter will save you money by not having to replace the filter all the time)
*have the PCM reprogrammed to have more pep.
I will say, (and don't take this the wrong way), it is a minivan, not a sports car.