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That measurement is not the one that really matters is it ?The overall length being "out" might just put the silencer forward or back slightly.The drop from the exhaust flanges to the collector would perhaps be relevant.Maybe measure from the top of each flange to the flloor?
I see that now !As the collector is made independently of the headers , the error in the alignment of the header sockets and the silencer stub during fabrication needs tight control..... and the tooling didn't provide it, evidently.I am a bit concerned too - I bought a set from Motad !