I bought this baffle kit for my rv-4. I had planned to i stall the oil cooler on the left rear baffle. However reading the instructions it implies that all of the stiffeners and other mods to support the cooler are "not required on the rv-4". It gives me the impression that the oil cooler is not installed on the aft baffle for 4 for some reason. Is this the case? I can't see it stated explicitly in the instructions. Does it have to go on the firewall instead! Is there not room for it?