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engine is a 4 cylinder, the stock runners are 34mm (1.33"). because of limisted space, im using 4-2-1 with about 1' length on the 1. I was planning on using the factory runner size of 34mm, what size should i use once i merge all of them? 1.5" or 1.88" The turbo I'm using is a GT1548 with the following specs.

Compressor
Inducer: 37.2 mm
Exducer: 48.0 mm
Trim: 60
A/R 0.48

Turbine
Wheel: 41.2 mm
Trim: 72
A/R: 0.35
Wastegated