4.8is xpipe installed-weird downshifting now..

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4.8is xpipe installed-weird downshifting now..

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05-08-2010, 11:17 PM

fmk

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Join Date: Oct 2009

Location: House, CA

Posts: 65

4.8is xpipe installed-weird downshifting now..

Installed an x pipe today. Placement is centered where the resonator was. Xpipe is magnaflow 2.25. Assuming exhaust piping is 2.25 as well that was used by the shop. Now in sport mode, the car does not downshift when slowing, it coasts. The tranny seems lost. Didn't have the problem before the xpipe install, but can't think of any reason why the install would cause this either... Anybody had this experience or feedback? Sounds awesome, but performance wise it has me second guessing the install.

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