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The current offering is just a good replacement for a cracked or broken 4-2-1 manifold if ya can't find one. I have the latest header on the RadioFlyer ('64 220) and it's just fine. No performance gains that I noticed (unless noise means HP), but it fit's perfectly. Does not rub (and I list problems I've seen): upper or lower a-arm, crossmember, floor of vehicle, alternator, or oil filter. Again, it's a perfect fit, and very-pretty, replacement for a difficult-to-find original manifold.
If you have an ipd header from the past (10 or more years?), it probably IS a performance-tuned unit.
A good, performance-enhancing header cannot be had for the price IPD is offering. It is difficult to find folks in the US to build headers for these old push-rod Volvos and keep them affordable.
VPD in New York, and others overseas, offer performance enhancing headers. One should consider the desired header in the recipe when building a motor.
Beast,
Shayne.
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