And the S52 will blow the S54 out of the water mod for mod. Good luck getting any management sub Tec3R/Motec to effectively run the S54 with any mods worth mentioning.
Dont get me wrong, the S54 is one hell of an engine. But your only options are Motec/Tec/HPFreaks and none of those are cheap options. Oh yeah, and you lose dual vanos if you go with Tec.