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Discussion Starter #1
I have a stock 03 6.0. I'm about to purchase cool duals. I don't know if I should go 4 or 5 inch exhaust. Is there any performance difference or is it just sound difference??
 

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Discussion Starter #4
aw shucks. lol well then i guess that makes my decision easier!!
 

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Discussion Starter #5
well if i went single straight pipe, would there be any performance difference or is it just sound difference between 4inch and 5 inch
 

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Discussion Starter #8
Ha ok . I'll just go with cool duals. I love the looks of 2 6inch tips pointing out the back
 

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is there a performance difference though? I have n 01 7.3 and I was going to get a 5 single side with a 4 downpipe. but its cheaper to get a 4. is there a difference?
 
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