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Does anyone have an opinion on the best sounding exhaust diameter for my 289. It has right around 300hp but 9:1 compression. I have hooker super comp short headers and Flowmaster 2 chamber 40 series. I need new exhaust (prematurly do to poor job) so I know what is sounds like with manifolds 2 1/2" and those mufflers but I have a feeling that it may sound better with 2 1/4" It sounds great but idles kind of quiet. Thanks Dustin
 

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2 1/2 inch will get you there.
 

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i am happy with my 2 1/4" quiet idle but gets loud quick. Also good for long trips but still sounds really nice. I have ported heads, tri-y's and the flowmaster kit.
 

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Put some headers on while your at it. the extra power (and milage) and sound will make it worth it. Even if they are some tri-y's.
 
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