the s13 boxes are the same design but different length (longer) than a mk2 silvia box, the mk1 box is a lot different and a slightly different length too. Changing to and s13 box does mean a wider range of boxes available and possibility of a close ratio version if you use the s14 box with the s13 bell housing. Im 90% sure that the mk2 silvia box bellhousing is teh same as the s13 tho.
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