To anyone reading, hello! I have enjoyed the site for a longtime and just recently decided to signup and participate. I have a few deadheads that I own that I am looking at for install (Clarion HX-D1, Clarion DRZ9255, and Pioneer DEX-P99RS). With the Clarion units I am wondering if people have experience with upgrading the internals (HX-D1 modifying to use McIntosh MDA5000)? I also currently own Helix MK2 Pro 8 to 10 with USB and Director, as well as a Mosconi 8 to 12 Aerospace with RCD controller. Interested again if others have much experience with modding their headhunts, and in what others have to say with pairing as far as head units and DSPs. I do have an old school AudioControl RTA to do testings within the cabin before and after. Currently amps are unknown, as are speakers and sub(s).