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The stock axle back is actually not very restrictive as the rear section is only a resonator. It's really hard to tell because the CP-E sounded faster but I never used it in conjunction with the N55 midpipe. Give me another week or two to put it back on and I'll give a better impression. I can definitely say that it doesn't feel any slower but I can't say if that's from the mids or axle back.
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2018 Jeep Grand Cherokee High Altitude Hemi | 2010 S4 Sold | 2010 BMW 135i Retired | 2006 Lotus Exige Sold
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