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GM coils are not as good as everyone says they are. In addition, they are simply bulky and a pain to mount and just plain do not perform.
R35 coil packs are the incorrect length. I bought my Taarks R35 GTR conversion kit as it was the cheapest and easiest solution.
G37 coil packs are almost identical to the R35. The only variance is boot length and an internal probe (the GTR coil pack has it, if my memory serves me correct, the G37 does not).
G37 should just about fit on the S13/S14/S15.
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