i have 2006 grand prix with the 3.8 non supercharged and i seen some performance chips on ebay does anyone kno if these really work? and if they would damage my car?

they don't work
they are trying to sell you a resistor that messes up the computer and has it dump a crap load of fuel.

what you want is a pcm
i suggest a custom tune from a member by you or an Overkill pcm from Will

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viewtopic.php?f=20&t=15751


that talks about them

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04 GP GT1 black spo grilles/spoiler, tinted led tails/third brake light, painted reverse bar, 6k lows/fogs, gxp door rings, STB's/DR brackets, DR door locks, GMPP RTA's, Wizair

ooh ok cool ill check that out where can i get that from?

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It's bullshit and will most likely screw up your engine, get your PCM tuned.
If you have someone local that does custom tuning do that, if not get a box tune from overkill or intense.

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Topswap - 4" FWI - 180 - 104s - Ploy Mounts - Full Exhaust - Custom Tune by FastKatt

If you buy one from overkill they talk about a core refund. Is that if you tune your car and then return it? and how hard is it to tune your car yourself with it?

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A core refund is when you buy a tuned PCM and then send them your stock PCM.

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3.5" MPS, 1.84 Rockers, 3" DP, Frt PEM, 39lb Injs., PowrTuner, Wizair
14.07@ 98.85mph 2.180 60'

oh ic. How much is it to take my car and get it tuned somewhere?

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400 - 600 for a good dyno tune

what do you have done?

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04 GTT - Retired
Best ET 13.016
Best Trap 115.56 MPH

so when they ask for what modifications you have. Should i say i have a fwi, or not because its the one that gpcustom showed in a link? And does anyone know how much the core exchange is?

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DIY intake-HV3-3" catless dp-180 tsat-DIY shift kit-murphy custom tune

usually the core fee for a PCM is around $100 most places ive seen like Overkill, ZZP, etc. You pay them an extra $100 when you buy the tuned PCM from them, then you install it, and send them back your stock PCM and they will refund the extra $100 you paid them.

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2005 Pontiac Grand Prix:|SE front|SPO grilles|HPTuned|HUD added|5-button DIC swap|Wizaired CAI|180*|EGR delete|GMPP rear sway|F&R STBs w/DRs brackets|3.29s|HD Diff|7/8" chain|WBS TA's|SD Headers|GenV SSM90 Hybrid(INSTALL PENDING)

x10 dont do it get a tune

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That's why a PCM tune is #9 on the list for our 2004+ GP's (04-08-grand-prix-discussion-f19/office-2004-mod-write-ups-and-other-important-info-t124.html)

Dang! I just did step 1 days ago (180* T-stat)....PCM tune is soooooooo far away

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