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MN12 production run of the Ford Thunderbird
198919901991199219931994199519961997
3.8L3.8L3.8L3.8L3.8L3.8L3.8L3.8L3.8L
3.8L SC3.8L SC3.8L SC3.8L SC3.8L SC3.8L SC3.8L SCN/AN/A
N/AN/A5.0L5.0L5.0L4.6L4.6L4.6L4.6L

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History of the 3.8L SC exhaust system 1989-1997:
From 1989-1993 the 3.8L SC used the same cast iron exhaust manifolds on the drivers and passangers side. Some normally aspirated 3.8L cars had both 02 sensors located in the exhaust manifolds. Then in 1994 Ford updated the passangers side cast iron exhaust manifold for the 3.8L by changing the angle of the collector on the exhaust manifold. In 1996 Ford began using "shorty" tubed headers in which the drivers side collector angle was changed from a 90 degree angle to a 45 degree angle which angled the collector towards the back of the car as the early cast iron header aimed the collector down towards the ground. The SC was the only Thunderbird available with either a 5-speed transmission or automatic and used either of the two style Y-pipe converter systems.(see pictures below)

History of the 5.0L exhaust system 1991-1993:
During the short 3 year production run of the 5.0L cars the exhaust manifolds and cat-back system never changed. These cars were only available with an automatic transmission and used the 3-way catalytic converter system with 8" resonator.

History of the 4.6L exhaust system 1994-1997:
During the the 4 year production run of the 4.6L engines in the Thunderbird the exhaust manifolds remained cast iron and the cat-back system never changed. These cars were only available with an automatic transmission and used the 3-way catalytic converter system with the 8" resonator. The 1996-1997 cars had the 8" resonator deleted.
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History of the "cat-back" exhaust system:

From 1989-1997 Ford used two different styles of exhaust cat-back systems. Beginning in 1992 the Thunderbird gas tank was changed (all models used the same gas tank) which allowed the exhaust intermediate pipe to travel down the center of the car as compaired to the earlier design which had the intermediate pipe routed around the gas tank. The normally aspirated 3.8L cars had a single mufflers on the drivers side while 3.8L SC and V8 cars had dual mufflers. Because of the rear valance the SC mufflers had a different turn down and hanger location compaired to the normally aspirated 3.8L and V8 systems (see "cat-back" pictures below).

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