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Old 10-29-2012, 05:19 PM   #5
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Join Date: Feb 2009
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Location: Salt Lake City, UT
What I Drive: 2001 Malibu Blue ZX3

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Stay with regular.. 89 is not regular is it? That octane will change by region and their altitude. For example in the great state of Utah regular is 85 Octane.

With that long tube header you should be thinking of a tune though. people have observed that they can get some what lean under WOT and a long tube header and free flowing exhaust.
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