were does the 3,000 number come from when using the stock harness? why would you have to get rid if the MDS? As i was looking at using a 09 and up challenger with the 6 speed manual. could you possibly post the link?
Get a 2009+ 5.7 that was for a 6-speed and it does not use the MDS. That would be my suggestion, although finding one may present a problem. Probably better off buying a NEW 6.4 for manual transmission. Could be cheaper in the long run.