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To sort of expand on what Ken has said,
We love to sell DOC manifolds and have a great relationship with that manufacturer (I even have one on my personal car, and we run them in BOTH of our race cars for Formula D)
The issue is, when we as sales people try to move the DOC stuff people all too often are quick to complain about the price (which for a hand tig welded, made in the US manifold is honestly a STEAL) they move to the lower cost manifolds such as Megan Racing, ISIS, etc. but somehow still expect the higher quality like DOC. If you want extremely high quality fabrication and high grade materials you have to pay for it, there is really no way around it.
Most lower cost manufacturers are working to improve fitment and quality, but they are not at the level of manufacturers like DOC. The V3 does have a much heavier gauge piping so it should be a marked improvement in longevity over the previous manifolds, but overall build quality and welding is obviously not on quite the same level of DOC, but then again the considerably lower price point reflects that (coming in at over 45% less than the DOC manifold).
Bottom line, if you want the best in quality materials and fab, go DOC, if you want a stronger manifold that will work well and carries good support and warranty from the manufacturer you can go with the ISIS V2 or V3 manifolds.
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