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<-Day Of Fail now SOLD
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Think the only benifit is more area to flow which lowers EGT's.
 

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I have one on mine and love it. But i also have an SCT too. So i can't really tell any lag but thats just me.
 

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Ive been told the diff is very little, but never drove a 6.0
 

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I have run stock, 3.5,and 4 and couldnt tell much if any difference between them.
 

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I have run stock, 3.5,and 4 and couldnt tell much if any difference between them.
How do you like your exhaust? I'm getting one in the very near future but I haven't decided on the 4 or 5 inch. I'm gettin 4 inch downpipe, it's gonna be straight piped, with a big tip.
 

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when me and my dad put the 4in dp in my dads truck it drop egts to a safe level when towing a 12k 5er. Without a load hard to tell the diff.
 

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How do you like your exhaust? I'm getting one in the very near future but I haven't decided on the 4 or 5 inch. I'm gettin 4 inch downpipe, it's gonna be straight piped, with a big tip.
I love mine. It will give a drone at 2200-2400 rpm while pulling that will drive you nuts but its still worth it.
 

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Like Fordfan30, I've had stock, 3.5" and 4" and there was no difference between all three of them.
 
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