Bypass factory amp, or leave it?

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toolmankan

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I just installed an aftermarket Pioneer HU and want to know if it is better to leave the factory amp in the loop, or bypass it? If I leave it in the loop, is the MOSFET 45x4 doing anything, or is the power still from the factory amp? I would imagine the mosfet would be better, but there's a lot of splicing work to bypass the factory amp. (unless someone is aware of a harness that does that?

By the way, I have onstar, no BOSE, and I had to splice my blue wire into the orange wire on the onstar factory harness to get power to my factory amp. Everyone else was saying the pink, but that didn't work on mine. 2001 tahoe.
 
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