muffler size 2.25 or 2.5

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Also which muffler is better super 40 or 40 series delta flowfrom flowmoaster? Does anyone have a straight pipe on their sporttrac?
 
I you are keeping your stock pipes...2.25 is the size...dont know much about flowmasters, I dont buy them...
 
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I've got a Delta Flow 40. Probably the only real difference between it and the Super 40 is that the Super 40 is a little bit louder.
 
I love it. It gives a nice rumble at idle, and you can hear it when you accelerate, but it's not loud on the highway. I can barely hear it inside the cab on the highway.
 
I had the Flowmaster 40 series, single in -- dual out, was loud inside, just recently had exhaust replaced with Super 40 gen. 11 delta flow, still nice sound on outside and much more quite inside........:)
 

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