3.4 to start.

Then go down from there.

The size pulley you end up running will all come down to weather the car likes it or not.

Id shoot for a bigger pulley size and mess with the timing than running stupid small pulleys for boost numbers.

Like 3.2ish with 18-19*, but the tune and how the car takes it, is still up in the air..... MPS would be the way to go.