Far from it.... hear one first hand and youll see. Either way Dodge engines are louder and sound better than any other make from what I've heard.

 

I should add that the cat is left on it's not like im running open headers

 

I agree, when it starts it sounds awesome and makes people around jump back. This is only a 4.7 too.

 

The story about warped valves is a throw back to the open pipes on motorcycles in the 60sand 70s. The major issue was the cool air finding it's way back to the engine when it was shut off. There you had no cats and maybe only a foot or so of pipe. Another change reduces the chance of valve damage is the harder materials used in the valves and seats with the conversion to unleaded gas in the mid 70s. Being an old timer, with limited knowledge of the flexibilty of the stock engine control module, I would question if a lean condition would occure. That will screw up the engine.

 

Learn from the experienced;

We are going to state this very clearly...Backpressure does not increase horsepower. Period.

An often heard statement from the well-informed is "You need a bit of backpressure for an exhaust to work". Usually this comes from someone who is not a tuner or someone who is faced with a situation where he does not have the tools or means to adjust things. Anything you do in the exhaust will change the flows, the pressures, or velocities somewhat. The correct scenario is that the exhaust has to be properly designed and then you optimize the jetting, ecu data inputs, camshafts, port dimensions, valve sizes and the like. The exhaust has to be designed for the intended use.

http://rbracing-rsr.com/exhausttech.htm