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Depends on the size of your bank! There was a Schwitters dog box for sale on an SCCA forum recently for $4000. Don't know what ratios were in it, but you could always swap out Hewland gear pairs to get what you wanted.
 

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Foe what it is worth, when I put a close ratio box- 2.54 through .85 -into my 1300 Veloce FP car, it was worth approximately 2 seconds a lap. Sears, Laguna, etc.
That has been my experience as well. I have always had a close-ratio box, but carry a stock box as a spare. A couple years ago I had a failure and swapped tranny's between sessions. I was 2 seconds slower after the change.

The "ultra-close" boxes by Schwitters and OS Giken (sold by Spruell) have great ratios. I think you can buy the gears alone for around $3K? I'm sure they are listed on Paul's web site.
 
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