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What size primary tube for a 706 on 2 ( I-S) systems 2450 lbs Bickel firebird, glide. I'm building some fender exit headers for the car. Thinking 2.5 or 2.375 with 4.5 collector Thanks
 

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I'd go 2 1/2, step to 2 5/8 X 5" collector, 28"oal
 
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