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Primary OD 1.625, Collector OD 3.0, Collector length on the header is 8.0 On the right side I might be able to go straight back for a total of 12" before I run into issue's with the tranny crossmember.

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Go with the 3" and try to make them as long as you
can without running into problems with the cross member
try to keep it far enough away so you dont restrict
exit flow

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