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is your air filter clean? also the way you drive the car can make a difference in what kind of milage you get....
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silver 99 grand prix gtp with Intense standard pcm, 3.4 intense modular pulley, oversized supercharger idler pulley, zzp underdrive water pulley, zzp overdrive alternator pulley, tps enhancer, open cone filter, thrasher shift kit, strut tower bar, eibach springs, autolite spark plugs, 180 degree t-stat, throttle body spacer, flowmaster catback w/U-bend delete, Rear O2 simulator, silvania headlights, xenon foglights, 40 cp reverse lights, and a custom 600 watt audio with cd changer.
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