its all in how the header/presilencer collects with the stock mid pipe which most RB exhausts reuse, and the hanger mount. for the road/race dual out header, it doesnt matter... one header fits all in that case, as it uses a different dual center section and RB's muffler for the '82 chassis w/ the dual inlet
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82 GS- GSL rearend, ported S4 13b, MSD 6AL, walbro 255, 460/550cc injectors, 2" dual exhaust, 3 row aluminum radiator w/ taurus E-fan
85 20v ST AE86 - sold to fund the 82
86 RX-7 GXL - donating parts to the 82
everything else - scrapped to fund the 82
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