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I have 2.75" oem diameter corsa on my motor and I don't feel it is a restriction. I just updated it to 3" using the corsa parts. I'll post my results when I get them.....my initial impression is it's not much of a difference. The hellcat guys are making over 1000hp with 2.75" exhaust. I don't think it's a big restriction

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I have a 3" slp on the car right now. But figured I could save a bit of weight with running turndowns after the mids and get rid of the catback. I just dont want to lose any power down low by doing so

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