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Just finished this build.

Stock untouched manifolds. "Mild" FAST build.

596 HP. 607 lb/ft trq.

Point is EH is a surface preparation. It does nothing in the way of "hogging out". Little of the parent metal is removed. And after a short time of run in, the manifold gets a coating of surface rust and carbon buildup, so any gains in surface prep quickly vanish. Then add to that fact that you still need to run it through a stcck type 2.5" exhaust system. Better than nothing. perhaps, but don't expect much.,,,

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Well said (and nice work BTW ). Everyone I've talked to said the exact same thing. Of course I'm doing a Pure Stock build so it isn't allowed anyway.

There are relatively HUGE differences in the rest of the exhaust system, though. The difference between the factory 2 1/4 compression bent pipes vs. a high quality 2 1/2 inch mandrel bent system is huge compared to extrude honing the manifolds. Then there are the mufflers............


Dave