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Could be your right on the cat part but i have never fouled a plug on my small outboard and while it doesnt have a tach, their was a definite speed increase , on my gt 380 two stroke injected suzuki motorcycle the magazines all tested it at about 100 mph top end, mine with no other mods peaked out at around 110, most of the guys using it leaned out their oil pump settings quite a bit , i didnt, but for me it was pretty awesome. I may try a bottle in the old ranger once I get a leaky fuel injector replaced, at 400 K they are starting to leak down a bit after a hot run, always something . thought at first it was a head gasket as the front and rear cylinders plugs get deposits on them but have never used a drop of water after the whole winter, so thinking and hoping its an injector issue.
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