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The performance systems all have flow through mufflers, so probably no measurable difference. If your rig is stock, I wouldn't go bigger than 4"..
 

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Is a straight pipe better then a system with a muffler. For mpg

thanks mike
You might want to leave the catalytic converter and delete muffler.You may lose to much bottom end .Unless you buy a Smarty the youll be ok.Or just get a whole new system with flow thru muffler.Aloha Ron
 
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