Yes it is extra weight, but maybe not too much on just the intake. Unforutnetly, if you don't cool that coolant it will just heat up and then act as an intake heater
. For this to work, you'd have to plumb in some tubing to run the coolant from the radiator into the intake cooler then into the engine as normal. This may or may not cause problems with coolant flow, but it will only cool the air to the temp of the radiator which may be _higher_ than ambient, so again, heating
the intake charge. The exhaust would be just as hard or harder.
But, there is hope, if we filled that space with a good insulator, which is much lighter, it would keep heat in the exhaust and out of the intake, but these ideas are what you might have had in mind to improve.
So, yes, we could wrap the intake with coolant, but it needs to be circulated and cooled somehow