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Discussion Starter #1
Has anyone changed out the factory muffler for a free flow without changing out the pipes? I'm considering a 4" cat back but after looking at the stock vs. 4" there isn't much difference. Looks like less than 1/2" probably 3/8". I'd hate to waste the $$ for a complete cat back if a muffler swap do.
 

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Do away with it all, straight pipe it 4" all the way no muff. no cat. WFO Racing...................................
 

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Discussion Starter #3
Do away with it all, straight pipe it 4" all the way no muff. no cat. WFO Racing...................................
We still have emissions tests. I don't want to change them out every two or three years. Besides, I got rid of my Cummins because it was loud. I can't imagine the sound of a straight through.
 

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yeah we dont have any test here so in that case i dont know i guess i would do 4 cat back
 
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