This sounds about right.Welcome to RamRebel. Do your self a favor and take the time to do a search on the cold air kits. You will find in most cases you are throwing your money away. The stock air filter system is a cold air unit in the ram. All you will gain with an aftermarket CAI is noise, and you take a good chance on loosing power because the engine will be sucking in hot air from the engine compartment. And the stock air filter will out flow the throttle body.
This topic was brought up so many times on the Challenger sites that no one would answer them any more.