FWIW when I talked to Travis at GH about the d1sc he asked me if i was going to forge the bottom end later. i told him i planned on doing that at later time, he still recommended the d1sc for everything that you would want HP wise on the street or the occasionally tracked car. He also recommended against the HO package because of something having to do with needing new fans and a reservoir known to leak. Mind you that kit is more expensive than the d1sc and he still recommended against it and pointed out they would support the same HP levels. I would recommend calling him, he races a car sponsored by procharger and knows those kits inside and out it seems.