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For a ( 2002 ) Mercury Grand Marquis : 220 horsepower ( 235 horsepower with dual exhaust )
alot
A 1994 Grand Marquis came from the factory with 190 horsepower (if equipped with only a single exhaust setup) or 210 (if equipped with a dual exhaust setup).
The right tool's, and a new gasket.
190, or 210 with dual exhaust option
200 hp for single exhaust 275 tq ,same for either, 225hp dual exhaust
On a 1998 Mercury Grand Marquis : Bank 1 is the passenger side of the engine Sensor 2 is AFTER the exhaust has passed through the catalytic converter
Behind the intake plenum.
Ask your local plumber for some of his scrap copper. Trust me, it makes great exhaust.
Yes , it is a V8 engine , so it has 2 exhaust manifolds , 1 on each side of the engine
Intake manifold gaskets are leaking, intake manifold is warped.
On a 1998 Mercury Grand Marquis : Bank 2 is the drivers side of the engine Sensor 1 would be in the exhaust close to the engine before the exhaust enters the catalytic converter ( upstream sensor )