Hi,
I assume you are talking about the 18R-C, as opposed to the 18R-G?
If so, the stock CR of the 18R-C is fine. Matter of fact I think the stock CR of the 18R-GU and 18R-GUE are in the 8-point-something also. But if it's an 18R-G or 18R-GR then I'd drop the CR down a bit for turboing.
seeyuzz
river
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