Does anyone know where I could get a heavy duty alternator for my 07 pontiac Grand prix GXP. because of all the new electricity requirements i will need. i am doing upgraded lights. underglow, interior lights, and upgraded tail lights.

Your stock alternator will handle that without a problem.

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2004 Pontiac Grand Prix GT2
MODS: Wizaired|Custom DHP Tune|180° Thermostat|DR F/R Brackets w/GMPP STB's|UMI Trailing Arms|Bilstein HDs w/SSC|Projector Retro|Black SPO Grilles and Spoiler|SS Inserts Rear Inlay|ZZP Volt. Booster & Alt Rewire

I agree, it should be just fine, we have a 135amp alternator and even with the lights, that draw wont be that much more that you'd need a upgraded one.

Yeah. If you are talking about upgraded tail lights being LED tails, they use less power than the stock incandescent bulbs. Also, if by upgraded lights you mean HID's, they use less power than halogens after the initial fire up. And underglow will add very little strain if any at all on your alt. so save your money for other mods.

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2004 Pontiac Grand Prix GT2
MODS: Wizaired|Custom DHP Tune|180° Thermostat|DR F/R Brackets w/GMPP STB's|UMI Trailing Arms|Bilstein HDs w/SSC|Projector Retro|Black SPO Grilles and Spoiler|SS Inserts Rear Inlay|ZZP Volt. Booster & Alt Rewire

Yup- what he said!

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Cold Air Induction System, Air Raid Throttle Body Spacer, Full LED Interior Conversion, Doc's Frt & RR STB's and Brackets, Med and Dark Tint, HID's (8000k) Dual LED turn sigs
Soon: Inferno Hood and new rims and rubbers!