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im going to install a Magnaflow # 12258... 2.50 in. Inlet/Dual 2.25 in on a stock exhaust.what size y pipe do i need.also would it be better to run the duals out the back and dump them or run duals upfront and single out the back.which way would have less drone and what other options do i have to reduce drone thanks
 

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I believe the jba y-pipe is a 2.25" to a 3" collector so I would try to mimic that one was much as possible since its the best y-pipe system for our trucks. I double it matter whether you go si/do or di/so, I would imagine it is just personal preference as too how many tips you want.
 
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