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So after calling MBRP and being told that their system is 2.5, and me not believeing them, I had my distributor check for me.. Turns out the exhaust is 3" but the dual wall tip reduces down to 2 7/8".. The exhaust is a bit loud for me so I am installing a second magnaflow muffler with custom resonated exhaust tip shortly.. Figured I would post up this info since I had a hard time finding it.. I dont know why anyone would make a 2.5 exhaust for this vehicle including magnaflow, the point is to gain power not lose it...
 

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I dont know why anyone would make a 2.5 exhaust for this vehicle including magnaflow said:
Probably has to do with backpressure. I'm pretty sure they tried the 3" as well. They dyno the cars, so this must be the set-up with the best sound/highest horsepower/torgue numbers.
 

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Anyone have a soundclip of the MBRP on the Hemi? I was looking on Youtube last night and all I could find were on Wranglers.
 
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