I, too, have an '03 GT with the dimming problem when stepping on the brakes (and also rolling up the windows when they're already up - thus putting a "load" on the circuit), and I have a horrible flickering/dimming (interior AND exterior lights) after the car is warm. Doesn't seem to happen as severely when the car is still cold.
Along with all this, my fan blower will correspondingly follow in step with my lights dimming and getting brighter (the fan speed seems to increase and decrease as the lights get brighter and dimmer, respectively).
I've had my PCM replaced (Stage 1), flashed (before the Stage 1) and have installed the Sun hyperground, all with absolutely no effect on the flickering/dimming/etc.
Also, the radio display (the one that shows the time or radio station number) does NOT dim along with the interior/exterior lights, but the radio controls/station preset button backlights DO dim and flicker along with the interior lights. Go figure.
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JC Moore, \'03 Cranberry GT, a.k.a. \"Zippy\"
http://www.mooresmopars.com/GT-Cruiser/index-gt.html
Stage1, BTG Strut Bar, Sun Hyperground system, Prototype Power CAI, no silencers, Eibach ProKit, Borla 2.5\" SSTL single w/dual tip, APC 2G Carbon Fiber Taillights, Chrome Fuel door, \'02 foldaway heated mirrors, OEM-style rear spoiler, Progress 22mm rear sway bar, TYC backup lights, Magnecor 8.5mm, stock plugs, MB Design \"Shifter\" 17x7.5 wheels, Goodyear Eagle F1 GS-D3 235/45/ZR17 tires
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