Exhaust System
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Improperly sized or incorrectly installed exhaust system components.
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Leaking exhaust elbows or risers (i.e. loose screws, damaged gasket).
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Improperly designed collector or Y‑pipe. See Exhaust System Design .
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Exhaust system causing a tuning effect. See Exhaust Resonators.
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Improperly functioning or missing water shutters or flappers.
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Muffler not draining.
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Engine damage.
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Poor engine running condition.
Page 6A-28
90-863758060 AUGUST 2006