Man what an interesting read TBH...
IMHO DC5R for me.. Not cause i drive one, it's just my opinion.
i Swapped with a mate for a week DC2R for DC5R... God... SR3's are fkn smaller..
Disaster to be honest.

C/F inserts look grouse.. mmm Carbon but i prefer the DC5R newer look.. it may not be as raw but new motor means GREATER potential IMHO
As others have said, it's not as tuned as the DC2R was..
Put a KPRO in a stock K20A2 and watch the magic mmmmmm

DC5R > DC2R