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Happy New Year!

It's generally assumed that; 17cm - 1a/r So to work out others; 16cm - (16/17) - 0.94ar 14cm - 0.82ar and so on So, the 16cm would be like a 0.95ar Garrett for example, so more aimed at higher boost/hp set ups really on the 6 pots, probably still boost mid 3000's at lower boost. Other things to think about too - are you going to use a proper twin scroll tubular manifold to slave the gasses, that would obviously help spool, or if you're running low boost or talking about low air/blade speeds, is the turbulent air from the divide going to be something of a hindran