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Discussion Starter · #1 ·
4" or 5" from the down pipe back straight piped the price for me is the same it s a deal im getting. Not sure what is the best to go with? :dunno:
 

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Discussion Starter · #4 ·
I just have the sct extreme. Is there a reason why you guys prefer the 4" over the 5"? Is it to loud or just no sense in it with a 5"?
 

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You will gain nothing by going to 5". The down pipe is only 3.5". If your doing a DPF delete system upgrade, finishing it off with a 4" filter back system would be perfect.
 

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One thing I did notice with my 5" DP back compared to a 4" is mine sounds a little deeper.
 
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