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It is very interesting that the 3.2 and SSI primaries are basically the same ID.
If the bump in power we see is at about 3000rpm with SSI's on a 3.2, a properly designed set of headers should be able to move said increase to a more point that might show more benefit like somewhere between TQ and HP peak.
Said bump seems to be about a 5% increase in VE at a given point.
On a 3.2 at 3000rpm that is about 5hp.
At 6000 rpm that would be about 10hp. This is what long tube 1 5/8's seem to do on a 3.2.
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