one one two turbos. Doesn't matter as long as it/they can breathe fast enough to fill the cylinders. To get rid of lag what is needed is a properly tuned waste gate. This keeps it/them spinning fast enough to avoid lag.

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2007 Suzuki Vinson 500 4X4
2007 Toro 6.5hp
2006 BMW X5 4.4 ltr (his)
2001 BMW X5 4.4 ltr (hers)
1994 Honda XR650L
1984 Honda XR80

"Beer is proof that God loves us and wants us to be happy."
Benjamin Franklin