I can offer the assistance that I belive that all the manifolds from 87-91
v-6 should match. As for teh backpressure issue tru creating some, eitehr
by crimping the end of teh pipe partially closed or bolting on a small tip
that does this. for the v-6 orig pipe was a single 2", so suals should
prob be in teh 1.75" range, at least for torque. A healthy v6 can use dual
2" though.
Hope this helps,
Chris
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