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Well I sent you my opinion in an email:thumbsup

500-500hp I would recommend the 5"
Under 500 I would recommend the 4"

The only benefit to 5" under 500hp is the better sound, in my opinion anyways.
 

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Washington Chapter Vice President
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the 5" is gonna have a deeper tone to it. I dont imagine you are running enough power to fully utilize the 5" exhaust so the choice is just a matter of $ and tone. 4" doesnt sound bad, just not as deep.
 

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I've got a 4" and not a day goes by when I don't long for the 5".
 

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Oh really why is that atc250? Sound Wise? Performance wise?
 

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Sound is mild, but (of coarse) quite a bit of an improvement over stock. The truck runs great, but as comp has mentioned with his setup, I run out of fuel on top and you better pay attention to EGT's. I have an airdog in the garage but (I know, I know!) I haven’t installed it yet. The main reason I want the 5" is because of all the things everyone is saying about the sound. I must say, I'm a little jealous of everyone that's got the 5". My 4" is great, sounds like a jet during decel but I know it could sound better.
 
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