Can You Guess Which Turbo(s) We Installed on this N54 BMW E90?

In today's episode, we're working on my buddy's 2007 BMW e90 with the infamous N54 engine. This is another manual transmission, rear wheel drive BMW in for a turbo upgrade.
The owner wanted more power and brought two options to us, one being a VIV 17t upgraded turbo setup and the other being a BIG single-jingle from ON3 performance, this single turbo swap utilizes a large 6466 turbo.
As my buddy wasn't sure which turbo(s) he wanted to install, he left the decision for me. Either we install the single turbo swap or the twin-turbos.
Which one's are we going to install? Stay tuned as we're going to flip a Canadian Peso to decide if it's a pricy upgrade or an even pricier one! After the install is done, we'll be taking it for it's maiden voyage and shake down.
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