Pontiac Grand Prix Forums : Grandprix

Im considering removing the resonator from my 01 gtp. The car is as quite as a cop car. Any video of how it sounds? Also what should this usally run? What else should I if i get it done to the exauhst? Im a little tight on cash, so dont say get a new one

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How To: E-Brake Pwn
2001 GTP. D/S Rotors * Custom Intake * DHP PCM *
Looking For - 3" in DP with Cat. PM me if selling

i've heard from others. it will sound like poop.


do a down pipe or a high flow cat. or both.

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I personally don't like the sound of a 3800 with no resonator and cat. There is an exhaust thread in here somewhere where people posted vids of their cars exhaust. I would check that thread out. Maybe you would be better off keeping the res and getting some aftermarket mufflers.

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Red 2dr 99 GTP "Old setup" Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

"New Setup" Back to stock

No res can sound good with the right mufflers. I doubt it would sound right on stock mufflers though.

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2004 Impala LS - got some mods sold!!!
2009 Subaru Impreza WRX STI

NAIOA moderator Still Imp'n, just in a different Imp.

As one with the resonator removed on stock mufflers I will say that I would have preferred to leave the resonator in there in hindsight. It doesnt sound horrible, but its not all that good compared to others Ive heard.

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Scotty Hall
2001 Pontiac Grand Prix GTP
It whines a lot, but I like it.

The only place success comes before work is in the dictionary.

Great spirits have always found violent opposition from mediocre minds.

Now this may sound a little noobish, but im not to sure what exactly a down pipe is. I believe its what connects from the headers to the exhaust under the vehicle (headers to resinator?).

How much does this usually run?

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How To: E-Brake Pwn
2001 GTP. D/S Rotors * Custom Intake * DHP PCM *
Looking For - 3" in DP with Cat. PM me if selling

Very right, the downpipe is the pipe between the headers and the cat back. the cat is in the down pipe, but most after market downpipes don't have cats

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2002 GT...Wizardair, ZZP 2.5 o/r dp, Special Eddition two-tone leather interior added, HUD added, 12" Brake Upgrade,strut tower bars, gmpp sway bars, poly motor mounts, -6an braided SS fuel hoses , Hptuned, Headers, Top Swaped.....
I've got Boost!! Top swap Quesions? Click Here

No cats = no admissions passing correct?

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How To: E-Brake Pwn
2001 GTP. D/S Rotors * Custom Intake * DHP PCM *
Looking For - 3" in DP with Cat. PM me if selling

correct

I've had several exhaust combos on my car over the years.

On a completely stock exhaust, removing the res won't hardly change the sound at all. It maybe a touch louder, nothing noticeable though. Even with a catted downpipe the sound won't change much. For awhile I ran a 3" RT DP w/ cat bolted to my stock cat-back minus the res. Again, it didn't sound much louder if at all. Now with a catless 3" DP it sounded bad. I of course did muffler changes etc etc

Today i'm back with my stock mufflers because the others I tried sounded like crap. Several things factor in sound of the exhaust. I think what helped me out a bit is the diameter of pipe used. The exhaust I have on the car now is the longest i've kept an exhaust on this car and it will most likely not change, although I may add a cutout. I run a complete 3" Exhaust, No cat, No Res, 2.25" Y pipe, Stock Mufflers with FT Tips. I had this setup for a long time on PEMs and now i'm running on TOGs. I think the TOGs deepened the sound a little. Its about as good as you'll get for a V6.

Thats my 2 cents...

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Shawn W. Larsen


'07 Chevy Trailblazer SS___'00 Pontiac Grand Prix GTP ___'99 Pontiac Grand Prix GTP

with no res, it will sound like this

Video of exhaust 99 gtp stock w/resonator delete - Photobucket - Video and Image Hosting

with no res and no cat, it will sound like this

Video of 3in downpipe, resonator delete, zzp powerlog - Photobucket - Video and Image Hosting

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245 HP/326 TQ
K&N CAI | 1.9 RR's | 105#'s | TOG Headers | Borla Catback | AL 104's | 8.5mm wires | 180* Thermo | 3.4 | AEM Wideband | Poly Mounts | Wideband Tuned | SSC Springs

OMG u guys werent joking. That really sounds bad! The second video sound like a bike when it gets reved up. Thats really ****ty.

Sounds good at idle, but when given gas its not good. Thanks for all the info!!!

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How To: E-Brake Pwn
2001 GTP. D/S Rotors * Custom Intake * DHP PCM *
Looking For - 3" in DP with Cat. PM me if selling

if you have cam it's not as bad. here's mine on a mustang dyno.

xp, pacesetter, 3" exhaust, no cat or resonator.


Video of first dyno - Photobucket - Video and Image Hosting

My Imp sounds find with SLP Powerflos, a little drone, but nothing I haven't tuned out and don't mind hearing now and then. Plus, when I punch it, I hear that S/C whine that overpowers any other noise. :-)

I'll probably be getting the res cut from my GP, as it's rusting. I don't mind the sound and would rather just pay $60-$70 to have it cut out and a straight pipe put in place than spend the money on a new one.

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2004 Impala SS - ZZP PCM, 3.4" Pulley, K&N CAI, TOG Headers, SLP Cat-Back, 180* thermo, Autolite 605s, PRJ Performance wires, Alternator rewire, GMPP Handling kit
2000 Grand Prix GT, Commuter Car - K&N CAI, GMPP Handling kit, ZZP downpipe w/U-bend delete, ZZP Plog, Alternator rewire