Hussein, if you already have the existing AC system, why do you need to modify it beyond changing the soft lines and putting in a new dryer? Asking because I am confused about why changing the HVAC in car system would need to be done to do all this given that the OE condenser and evaporator are 134a compatible. The existing heater valve could be supplemented by a bypass valve in the engine bay or replaced by a manual version controlled by the existing cable in Rodger’s position to maintain the way the Honda thermostat is looking for flow to occur. The existing ducting across the car effectively is what Rodger mimicked. Given you are looking at a custom dash, deleting this and going to outside air corner ducts (as in a non AC X system) with just the defrost, floor and center ducts providing conditioned air would likely be more than sufficient given the size of the cabin. From the statements Rodger makes the Fiat HVAC unit is more compact than the Hurricane unit so just curious about your thinking. My ‘new’ X has air and is also looking to have an alternative engine upgrade so just trying to learn as I will be facing a similar issue in my future.