on my truck, it reduced the noise by maybe 20%... there are better ways to get rid of that whistle though like some edge trim on the fins, or some 3M foam
42 inch curved shield installed on another tacoma
^ thats exactly what i did
I made a batch of them, 42 inch pieces only for now, they are on sale at my website if you want to check it out WWW.JUSTOFFROAD.ORG