Hey guys I am new to this. I searched the forums and everything seems confusing. I find lots of adds about the 07+ but I have a 06 SS/SC no onstar. I am looking at installing a clarion vx400 ( http://www.clarion.com/us/en/products/2010/multimedia/multimedia_source_unit/VX400/us-en-product-pf_1259394334491.html )
Could you guys please tell me what I need to do. Visions said they can sell me a harness for 120 does that one still need to be repinned? If I get the cheap one will the pioneer system with sub still work?

 

OS-311B or metra 70-2103, dash kit, gm antenna adapter