Back to the 87 vs 89 vs 91/93 octane I was all was under the impression that if driving normal ;) if that's possible octane could equate to MPG'S meaning if you spent more money on higher octane fuel you get more Mpg.
That's kind of want I was thinking cutting the muffler out replace with crosse over pipe or just straight pipes move two smaller mufflers close to tailpipes
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