Quote Originally Posted by dbinnc View Post
Just read the how-to. Little update. the 2008 GP uses the gmos-01 not the gmos-04.

Little 2010 Update

Maybe a 2008 without the Monsoon but the amp doesn't have line-level inputs on it with a Monsoon system. Therefore, you need to have RCAs to output to the stock amplifier. I personally just soldered some on to the aftermarket harness and plugged it in.

I haven't tried to simply wire it from the aftermarket head-unit's speaker levels, but would presume that would be WAY overpowering to the amp's inputs.