B Conversion Base Kit for FD3S Third Gen Rx7 Defined Autoworks still remains the one and only to produce a b conversion kit that keeps the stock subframe!13b peripheral port induction;13BT vs 13BREW (Last revised 97) There are two types of 13BT blocks, one from the 87 Turbo RX7 (FC3S GTR) and one from the 91 Turbo RX7 (FC3S GTX) While the older 13BT GTR block differs a lot from the 13BREW block,
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