| The manifolds were flowtested at 28" (1psi vacuum) draw-through. Each port tested independently. 
I'm very impressed with the consistency of flow between each of the runners as well as the flow volume. I also tested the manifolds with the stock gasket over the open port being tested to get an idea of what they flow with slightly ported heads. Keep in mind, the gasket's opening is slightly larger than the OEM exhaust port size and the MS manifolds have quite large openings to them. The AAE cast iron manifolds have matched openings to the gasket so to make the test as "apples to apples" as possible, I ran the test again and got these results: 
The MS Manifolds still have excellent balance of flow, but the flow volume is compromised below that of the AAE manifolds. (more on this below) A comparison of the AAE vs. MS Manifolds (without gasket): 
MS Manifold TOTAL Combined Flow: 1395.6CFM
MS Maniflld Average Flow: 232.6CFM AAE Manifold TOTAL Combined Flow: 1304CFM
AAR Manifold Average Flow: 217.35CFM It is clear by the charts that the MS Manifolds are superior in terms of equality of flow from one runner to the next as well as total combined flow and average flow. However, it must be said for equality's sake that the MS Manifolds with the gasket in place produced lower flow numbers than the AAE manifolds did, but the MS manifolds still had better equality of flow between the runners. Unless you port your cylinder head exhaust ports out to the same size as the MS manifolds openings, they are going to flow notably less than the AAE manifolds. So keep this in mind when you install the MS manifolds: you need to port match the cylinder heads to the manifolds to really tap their potential. This also applies to the AAE manifolds as they also have larger openings in the manifold inlets, but not as much so. I would expect that most people who are installing aftermarket manifolds ARE porting their heads to some extent or another, otherwise you will be compromising the potential of your dollar per horsepower. I have also uploaded the excel spreadsheet that contains all of the flowtest data and chart. You can download it from my site here: [ http://ashspecz.com/Documents/MS%20MANIFOLD%20FLOWTEST/MS%20MANIFOLD%20FLOWTEST.xls ] An benign, but somewhat interesting point: These exhaust runners are flowing volumes of air that are comparable to the flow results of most of the aftermarket intercoolers. Enjoy your lunch. :)
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MS Manifolds Flowtest & Comparison to AAE Manifolds - 
11:58:38 02/14/07
