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I would think autozone would rent out oscilloscopes... it's such an integral tool I'd be a lil disappointed if they didn't.
But hey, I did indeed get like.. 4-5mpg better when I changed plugs. Went from just barely making 20 to just barely making 24.
Can't really comment on the catback/ low backpressure... but did ya mess with the manifold at all that would make it leak pre-o2?
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