After doing the lay-up and installation of the targa on my tipper -7, I found that the seal was tight enough to cause a whistle on the front edge of the tipper which I hadn't had before. After tracking down that one, I find cockpit is remarkably draft free with minimal wind noise leaking through. Additionally, even with the annual Oshkosh deluge, I had no water leakage into the cockpit. One minor detail, use good quality structural glue! Somewhere in Oregon there's a farmer wondering about this strange fiberglass part that fell from the sky (I like my 2nd targa much better)!