jun_ek9 : if u r running 2.0 on a b20b there will be issues regarding making it boost , vtec conrods are thin like lidi compared to 1g dsm's , and 1g dsm's run on 7.8:1 compression which enables to high boost without change of piston, thats the reason 400hp car is able to be made without internal changes.
as for 5XX--6XX cars , dsm world usually have a change in piston , billet conrods , high cams such as comps n crower.even a gt35 produces 5XX - 6XX power , doesnt need a gt40 or gt42.
the 5XX powered gsr is running on drag battle yellow car , came out in hypertune 6 months ago from DSP