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Honestly, I would rather choose a standard H cover if you are looking for the fastest spool up. I know that the HPS cover will slightly affect spool up as some of the air flow is redirected through the ported shrouds' channel and back into the inlet, never making it into the turbo. This will affect the spool up.
I am going to do some testing the next time I go to the track with my setup. H cover vs HPS cover. My plan is to make two passes with the HPS cover, then two passes with the standard H cover and see if the spool up and ET/MPH change. I will probably do this test in late Sept when the weather gets cooler. No sense beating on the car in hot weather.
Hope this helps.
Patrick
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