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TUNER's .. exhaust CUTOUT !! HELP

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Old May 31, 2010 | 08:21 PM
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Reaperchild's Avatar
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Exclamation TUNER's .. exhaust CUTOUT !! HELP

1 3/4 headers to 3.5 y pipe all the way to stock cat back ... electric CUTOUT in Y pipe ... plan is to dyno tune with cutout open ...... but need to cruise almost always with a quite exhaust = closed cutout ... what are the bad parts in this proccess ....!!
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Old May 31, 2010 | 08:57 PM
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you should be fine. i have a buddy doing the same thing with no problems.
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Old May 31, 2010 | 09:32 PM
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You'll be fine. My car was tuned with the cutout open and I have it closed 99% of the time, no issues.
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Old Jun 1, 2010 | 01:07 AM
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As long as you have your MAF sensor still enabled and working, itll still be accurate.

It might throw off a speed density tune a little but on my car it is only a few percent difference in fueling. Keep your o2s enabled for closed loop, itll be able to adjust even if in speed density mode.
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Old Jun 1, 2010 | 06:23 AM
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So do your dyno tune in the idle/cruize area with the cutout closed, and do the WOT with it open.
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Old Jun 1, 2010 | 08:40 PM
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thanks guy's ... tomorrow is the cutout & stock catback install hope to get it tuned out on the same day ... Input Appreciated
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