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I've replied already on another forum, so for benefit of members in here; HPD MAF housing lowers voltage about 0.25V give or take. Without increasing the fuelling via diesel chip the net effects are power loss at low to mid range, no limps though as it barely comes anywhere near the limp values hence 20 psi max boost and no limps.
HPD actually notes in regards to this housing that it is not suitable for unchiped vehicle.
I run one without the chip but I manipulate MAF voltages via JDVM unit and it is a pain to set up right with the HPD housing, very intermittent and inconsistent due to ambient temps and easily limps on aggressive settings in colder weather especially....
I've regretted the purchase a long time ago...the airbox lid and cobra intake hose are good mods but the housing requires a chip and tuning on dyno to get the best out of it.
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