if you havent already done this you can remove the air silencer, put on a K&N, or a complete cold air setup. Not sure what you'll get out of that cause im not to familiar with the 4.6 motors, but hey, worth a shot, besides colder air into the motor is less prone to detonation 
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87 GT T-roof (needs paint) lol, rebuilt motor and trans, AOD - stage 2 shift kit, 3.73 gears - auburn posi, Dynomax Super Turbo Cat Back, FRPP 155lph fuel pump, K&N filter - air silencer removed, subframe connectors, strut tower brace.
88 GT T-roof
1989 LX Coupe 5.0 - 5spd
Rice Haters Club member#105
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