The ATS 2029013228 Ported Compressor Housing is designed to increase life in your 99.5-03 Ford 7.3L Powerstroke by eliminating the damaging effect of compressor surge. Offering significant advantages beyond a replacement compressor wheel, this upgraded housing with the factory wheel actually flows more than the popular compressor wheel replacements. Anyone who has ever towed with a 99.5-03 Powerstroke has undoubtedly experienced compressor surge and flutter which occurs between 1800-2200 rpm. When performance products are added to increase horsepower, the compressor wheel accelerates faster and compressor surge and flutter becomes more apparent and damaging Another great benefit of the ATS Ported Shroud is a quieter ride. An opening wastegate, a bad torque converter, or a loose cover plate are a few of the excuses which people mistake for the compressor surge noise. Forget about it...with the ATS Ported Compressor Housing.