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The kit does not fit the 4.7. In most cases with exhaust, under normal driving conditions, fuel economy can see an improvement, but of course if you are flooring it all the time then no.
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2007 Toyota Tundra 5.7 Slate, Double Cab
1990 Nissan 240sx - Daily Driver
1989 Nissan 240sx Pro Drift Spec (the HATCH) - FOR SALE -
1991 Nissan 240sx Pro Drift Spec (the COUPE)
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Performance Parts - Technical Consulting/Support - Track Proven
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