Thats the air pump for California-emissions Impalas. There should be a hose that it connects to that goes to the exhaust manifolds. You've swapped your engine so more than likely dont have the Cali manifolds anymore.
Just unplug and remove the air pump and save a few pounds.
_________________ 2002 Galaxy Silver Sedan - LS cluster - Debadged - Intrigue compass/autodim mirror - DIC - Regal graphite leather seats - LS console with floor shift conversion - Monte Carlo black leather steering wheel - LS springs - KYB GR-2 Struts - GMPP sway bars and rear STB - Fog light frontend harness - LS Bumper with fog lights - Painted trim and side skirts
2006 Nissan Murano - Autodim/compass mirror
2006 Mercedez-Benz E350 - Stock for stock, its faster than an SS, woot!
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