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Message: [QUOTE="IHPowerstroke7.3, post: 1294443, member: 7642"] I'll first say, I'm no expert. But the top picture is a ported compressor housing, the bottom picture "race cover" is a non ported housing. Differences? A ported housing will have a wider map/efficiency range. This turbo would be better suited for an engine that does not see a consistent RPM range, and doesn't need max air flow from the turbo all the time such as a daily driven vehicle. Without a ported housing, when the turbo has "spooled" and it is producing more airflow than your engine can consume, you will experience compressor surge. Compressor surge/ stalling can cause turbocharger failure. Ported housings essentially slow down airflow on the compressor side. The "race cover" is just that, designed for the high performance consumer. It is not "ported". Efficiency range will be narrower thus needing to be better matched to your setup. A narrower efficiency range is less ideal for a street application because of this. A non ported housing will have more air flow available at the top of its map. This is more ideal for a "race" setup that will be pushing the turbo to its limits all the time. Think of a stock 7.3 with a stock turbo, no issues with surge. Add some more fuel, keep the engine stock, stock turbo will experience "surge" because the added fuel is driving the turbo harder, engine has not been modified, and the turbo falls outside its map. Adding a ported housing somewhat fixes this concern. Look at a 38r, ported housing. [/QUOTE]

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