Definitely try a Noise Isolator, we sell tons of them and for the price it is definitly the thing to try first. 8 out of 10 times it is the fix for us.
BD Part Number 1300030
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03 Dodge Ram 2500 2WD Reg Cab
BD X-Tuner stacked with BD X-Power
BD Super-B Turbo & Dual X-Hale Exhaust
BD Max Flow Lift Pump
Ice Box Cold Air Intake
Toll Free 800-887-5030 ext 105 Dave
www.dieselperformance.com
dave@bd-power.com