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1994 Cougar XR7 DOHC/5-Speed
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Preston went through a few manifolds experimenting when he was doing them, these severe porting ones are right on the edge of “too far”, part of the reason he coated them (he was braincoating afterall) was probably as much to prevent future corrosion from penetrating the thin areas like where it’s clearanced for the steering shaft, so keep that in mind if you try to DIY, without coating I’d just stick to grinding off the lip in the right outlet and softening the curve in the left one.
 
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