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The 5" is more for sound unless you're pushing tons of horsepower...there's not a difference otherwise. I personally loved my 5"....until I got my 4" duals.

Chad
 

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Discussion Starter #3
that's pretty high up there. I tow a lot so 5" may be were its at for me.do yu have a 4" downpipe as well?
 

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Haha yeah it is lol....if you're going to be towing A LOT I personally would order the 5", it's not a HUGE noticeable difference between the 4" and 5" without a trailer but with the 5" and a 10, 000 lb load I noticed a small loss in low end power with the trailer on. With whatever you decide give Eric at Performance TRuck Products a call. I've ordered my last 2 exhausts from him. He's excellent with customer service and shipping is fast!

Chad
 
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