TB spacer ? Manufacturer Part #: 200-617
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Now one of these TB spacers is what you should be looking for
Nitrous Outlet » Online Catalog » EFI Nitrous Plate Conversions » GM EFI Plate Conversions
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#8
It helps alot with throttle response and drivability. I don't know the hp figures, maybe 5-10. It took my truck about a tank of gas to start feeling the benefits of it though. No tuned needed after install.