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VTT is garbage. Stay far far away. The GCs have a known issue of blowing up, well documented, even VTT has to publicly admit it now. Owner beats women and has been arrested for it, you can find the info online. Scummy company overall. Owner isn't even allowed to post on the forums anymore because he is such a jack ass.
RB or Pure are the only reliable solutions on the market for the N54 upgraded twins.
I vote get a single turbo as they are more reliable and better top end on pump gas. Twins you really have to have full E85 to make good numbers like anything close to a single turbo.
Whatever you do get a custom tune. Running OTS maps is weak, cobb maps are old an outdated and you can make a lot more power even on stock turbos. Get MHD and a custom tune. Or at least run MHD and OTS maps.
As far as the fueling comments above I can answer them accurately for you. What fuel do you plan to run, which FI solution, and what HP goals? That is all you need to decide on which upgrades, if any, you need to do.
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