[Heli ATP]

The Boss CE200M amp is one of the least expensive options for keep the SUB with and aftermarket HU. See here...

http://www.ridgelineownersclub.com/...g-stock-sub-new-radio-hu-boss-ce200m-amp.html

There are a couple of steering wheel control modules that allow you to keep steering wheel controls. The PAC SWI is a pain to program. Axxess Aswc self programs. With proper installation results are equal. Idatalink has an option that will allow gauges in addition to steering wheel control.

http://www.ridgelineownersclub.com/...233-kenwood-excelon-dnx893s-hu-install-4.html

 

[Heli ATP]

I'm surprised we don't see more sales between members of the ROC. Maybe if you list what you are looking for (Model / year) you might get one here?