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If you have an EGR, it would be bolted to the right side of the intake manifold. I believe the '92+ G10s all had it, I'm not sure about the older ones. I know the 1989-91 G13B did not have EGR outside of California.
Stacking two rings in interesting for a gapless setup, but is it better than using the non-XFi pistons as far as friction is concerned? The oil ring rails are pretty thin if a "shim" is needed. 0.47mm on my NPR set.
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