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I think you need a little more information from this kid before installing the S-AFC and any new injectors. What is he currently using for fuel management, what is his wastegate set to, and what are his plans for the car?
The S-AFC doesn't do a whole lot for these cars, certainly not enough to effectively control 450cc/min injectors without some other sort of mechanical fuel management. However, at the point where he actually needs larger injectors, the stock bottom end won't be able to keep up.
If the wastegate is set to less than 8psi, I suggest he use a 12:1 FMU with stock injectors. If it's set higher, he'll need to evaluate the strength of his car's pistons and rods and go from there: most likely settling on an S-FMU and possibly the 450cc/min DSM injectors.
Also, you were right to add inline resistors, but I don't think the DSM injectors will fit in the 420A rail/intake manifold...
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-Paul
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