Gears definitely. If you are wanting a sleeper, get a quiet aftermarket exhaust. Underdrive pulleys would also be good.
You could also extrude hone the intake.
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2006 Mustang GT
1990 LX
GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved)
1998 Contour SVT
Rice Haters Club Member #244
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