Unsure which new Carb to pick

RustyRatRod said

Yes, I would go with whatever size pipe the header collector is and not make a reduction there. Never been a fan of reducer collectors. After all, headers are a performance mod and if you're reducing the size of the pipe, how can that help performance?

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Actually, a reduction at the end of the collector is what makes it a collector. This size reduction sets the collector length, and that along with the primary tube length, sets the RPM at which the collector is most effective in extracting the exhaust. The collector can be tuned like the primary tubes.