Has anybody ever switch from 7 bolt to 6 bolt in a 2g?

It's throwing me a CEL and running really weird. I already went through this with my 2g CAS, which I switched with a 1g CAS. Was running fine for a while just like the 2g was but now it's doing the same thing. Any suggestions?

Somebody mentioned DSM link to me, but I don't know how much that costs and all that shit. Any input would be greatly appreciated.

Thanks guys.