Dzl860

I bought a 2006 Accord EX from a trusted mechanic and ever since I have noticed a loud noise that is only present when accelerating or decelerating past 20mph. Starts from around 17mph and goes until 24mph, same when decelerating. It sounds like a loud "wub-wub-wub" that gets louder and softer the closer I get to 20mph. The noise has been present since I purchased the car about a year ago but never thought anything of it. I recently replaced the brake rotors, pads and serviced the calipers and figured I'd check in on it as I want to try DIY repairs instead of being robbed by a mechanic.

Is this normal for an 06 Accord with manual transmission? Happens when I am in gear or in neutral. Any thoughts would be great! Thanks, Jon