Quote:
Originally Posted by Qcity
Ps. when i first put the exhaust on, it did have a nice crackling sound upon downshifting. lately (1000 miles later) it dosent do it anymore. When it did i was using shell, then swiched to chevron. Maybe an additive in shell makes the difference? Also is a little bit quieter(but nothing quiet about it above 5000rpm). IDK, that my theory.
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The exhaust just broke in. The gas you used has absolutely nothing to do with it.