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I cut off my 3rd cat on my 4.6 Just wondering how much difference is there between a Y pipe or doing true duals?

I have 2 flowmaster 40 series on now, and i either plan on putting a Y pipe where my 3rd cat is, or just do duals to my current mufflers at the rear.

I'm trying to get the best bang for the buck. Any ideas on the cost to do these? THANKS
 

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I think the cost will be roughly equal either way. And the performance is probably close. If you use a y-pipe, you should make sure that the area of the single pipe is about equal to that of the two smaller pipes put together. A = pi*(r^2), if you will.
 
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