I just got a car back after a rebuild and I noticed a strange noise under acceleration.

There's rhythmic noise coming from the passenger side (right side) of the car whenever I hit the gas above 2,000 rpm while driving. The car doesn't make this noise if I just rev the engine while parked.

My car sounds almost like a VW bug (the aircooled one) under acceleration!

The engine's supposed to be a streetport with 3 mm seals, and the car's got a DP and RB cat-back.

Do you think it's just an exhaust leak? Thanks for the help.

 

If the tempo of the noise is equal to the rpms I'd say it's an exaust leak, but Your're gonna have to be the one to figure ot out. Start the car, open the hood, listen for the noise, give it gas, listen for the noise, you'll eventually find it.