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Old 01-03-2012, 11:42 PM   #5

caverman's Avatar
Drives: '69 SS Convertible
Join Date: May 2009
Location: DFW, TX
Posts: 7,111
I'm pretty sure the Flow Master cat-back only comes in a 3" exhaust. Realize that the first part of the cat-back will be 2.5" to match up with the factory mid-pipes or aftermarket HF cats.

Stick with 1 7/8" as it will be the best all around header unless you know you'll be in the 600+ range. In that case 2" might be worth the extra money.

Also know that the size of the primaries has nothing to do with the collectors. The collectors is the part where all the primaries come together and is usually 3". You'll then have a HF cat that will have a 3" inlet but a 2.5" outlet to hook into your cat-back.
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