Every hole you put in a home (vents, windows, doors, etc.) allow sound in in some manner. Air sealing has almost as much to do as the windows themselves. I agree MI windows are junk but I do not think windows alone will solve your issue entirely.

oberon, thanks for your detailed reply, here is what I got from the acoustic company. They did not address any concern with walls, attic, outlets etc., they just said it should be to code.

For the inserts, lower frequencies are showing -16db, the 50db is a sales strat and was likely worded up to 51db reduction

I'm at my wits end, I am thinking I may just take the loss and sell off the property, doesnt seem like windows will help too much. I just want it to the point where its not interrupting my sleep and reverberating through the whole house.

Something you might try just to get a feel for what's happening is pick up a couple moving blankets from harbor freight (because they are really cheap), hang them over your window to see if that makes any difference at all. Use some packing tape to try to seal the edges. I wouldn't expect it to make a huge difference, but it might suggest how much of the sound is coming in that way, or if you need to look at the other possibilities as well. Best case that it seems to make a difference then try to cover the wall that faces the roadway and see what happens. Again not definitive but could be suggestive if you do notice a difference.

I am not impressed at all with the "acoustical engineer" approach to improving the sound performance of your home. Sounds a lot more like a window insert sales visit rather than a performance evaluation.

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How do I go about getting a sound audit to learn how sound is coming into the home? Has anyone been able to solve this low frequency vehicle noise from living on a street corner. As a reference point, I can hear the crickets from my yard through the windows in my study. I put my ear to the wall and could hardly hear them. Looks like big war pocket in the windows themselves.

As far as batting in the attic not sure who can help me look at this...

Was a great window that I used previously with success.

Let's see what you are seeing.

Just wondering how people can sleep well near BQE. properly you can try to replace one or two windows with insulated glass units, It will not cost so much. Taking action will yield better results than any speculation on paper.

" My current windows are MI v2000 windows with an STC of 27db but they let so much draft and noise in I would like to replace them. "

Well kevin , if you read the OP's post, you would see that they have MI v2000 windows. These already have Insulated Glass. It is not "speculation on paper" in saying that insulated glass alone will not make a bit of difference.

But milk I've read cases online of customers who replaced builder grade windows such as mine and have decent results. Do you think replacing windows will not help in my case? I want to go for dissimilar glass with lamination

My response was to kevin Jason and his claim that insulated glass would solver your issue. My response to you is the same as the other day. It is an overall issue, the windows are only a piece of the puzzle. Air sealing, insulation all play parts in this as well. Windows alone, "insulated glass", laminated glass or dissimilar glass alone will not solve the issue.

Builders grade windows are usually so poorly adjusted and ill-fitting that the larger issue is the air leakage.

Look for a new window with some offset glazing or laminated glass and DEFINITELY with a great air infiltration rating.