|
Vtt has to cast their parts to make a new exhaust manifold to fit to the engine since the stock BMW one is a one piece design.
They needed to cast a new turbo housing like Sean said was to keep the stock downpipe fitting properly, and have the outlet of the turbo point forward instead of up like on regular gtx 3076r's, to make for better turbo to intercooler pipe fitment (probably stock will fit).
In terms of reliability the 2015 models had issues from what I hear but since then they have perfected the GC 2.0 for the n54, in terms of spool it shouldn't make a difference because it will flow more than PS2 at all rpm ranges, and make more power at all rpms. Plus I heard all of their failures came from their custom chras leaking due to bad seals, wheels exploding etc. If they use oem Garrett parts there it shouldn't be an issue, the casted parts should be fine, plus they offer ceramic coating to deal with heat.
Yup I saw that n54tech post, I frequent that sight alot.
|