This and it has the mud flaps that lead me to believe the previous owner put in some work

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Pics of a GMPP mangaflow system. Does your exhaust have clamps at the Y pipe and 1 at the second bend after the resonator? If so, then it's not stock.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

does add anymore horsepower, will gas meilage suffer?

-- Tue Nov 22, 2011 6:34 pm --

i will check about y pipe car is not here at the moment

no and no on both exhuast do not do much on these cars maybe 10hp but that can be writen off as dyno variance

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

The stock cat back system really isn't all that restrictive and can handle upwards of 300HP. The manifolds, DP and old school ubend crap, however are quite restrictive (not so much on N/A motors though).
Mileage will not decrease as Tom said. Most mods actually net higher MPG's due to making the "air pump" aka the engine, work more efficiently.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

Sooooooooo Niko it seems I was right all along, yet you kept insisting your car was stock over & over again.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

But Don....

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

Matt in that case I take back 2 bad things I said about him.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

It sounds like he's relatively new to GP's and he went by what his mechanic said.
I think in his shoes,I would believe my mechanic too,until I found out otherwise.
Looks like he did find out otherwise.
Perhaps he'll be smart enough to buy some of your strut tower brackets,if he doesn't have some already?
That's a very good move.

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2005 GT owner [Non S/C] with a "big DIC".
Two years later and I still love the car.
Thanks Pontiac...Bleen is keen!