charger r/t flowmasters and intake

hey guys im new here i have a sliver charger r/t. i have add two flowmasters that where custom made from flowmaster and used the stock chrome tips. i liked the sound but it only rumbles when the throttle is open. also i added the k&n intake system. that sounds wicked it really has an exotic sound to nthe car. the response is awesome when you push on the gas. and trust me both tires burn with no problem i dont even have to try.