I can't say if moving the exhaust from the rear to the side will eliminate the sulfur smell with the windows down, as I never have the windows down, but with the windows up it is night and day difference. Had the smell stuck around I would have had the cats replaced. I know the 4 runner still makes the smell ( a lot of cars do when pushed hard) because I have followed it in another vehicle on steep hills on the freeway. I mostly moved the exhaust for looks. With the nice surprise of no more smell.