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Old 01-30-2013, 12:12 AM
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They will all have a bottleneck, but the TRUE TBs have a more gradual taper and the butterfly valve is the size of the advertized diameter. Now, I don't know anyone that makes an 83mm TB, the smallest I have seen is the 84mm from fastman, but if anyone does find ones that I didn't mention let me know, I would love to find more sources.
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