get the guy that is real nice ( Darrell ),,have him take you to a few (2-3) cars like yours, start those up and listen if the noise is there just like yours ,, If it is it is a common thing , But if there is no noise on the other cars ,, they need to fix your car to your satisfaction

 

^ x2.Another brand new 07 should make the same sound.If they show you one and it does not make the noise, you need to get a tech over and ask him why the new one doesn't make the same sound. if it is not normal, tell them either to fix yours, or to give you a new one that does not make that noise. Tell them if you are not satisfied you are going to contact Honda of America and report them.