I've read a few threads about aftermarket exhaust systems for our cars.
I'm at the point where it's getting close to that time.
I'm wondering which systems flow reasonably well and aren't too noisy ..... close to stock,if possible ?
I'll be doing a full stainless system with resonator.
I'm thinking I might even use the SPO tips I'm running now with the new system for the stealth look.
Anyone got opinions on the aftermarket stuff,now that you've lived with them?
I've been looking at the Magnaflow.

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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!

hmmm hard to find a muffler that would alloow enough flow but still be quite

i would look into the mufflers from a CTS cadillac see if they would fit thous would allow flow and would be quite

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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 guy I talked to said the mufflers on the Magnaflow system were fairly large.
That should help with noise control.
I would like the sound to stay as close to the stock sound as possible.
A little extra rasp when I hit the gas is okay,but I don't want a lot of boom at cruise.

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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!

i had a magnafow on my lebaron it was louder then stock. the magnaflows are glorifide glasspacks

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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

I love the sound of my slp powerflo. Its price isnt too bad either at around 500. The best sounding cat back for our cars in my opinion has got to be the borla. But at over $1000 its a lot of money. I had a magnaflow cat back on my v6 accord back in the day and it sounded pretty good. It didnt make much sound at the mid or higher revs and it kinda droned loudly while cruising, but it did make a deep classy sound (no rice). I would definately recommend the slp powerflo if you dont want to spend $1000 for a borla or corsa. You get the choice of round, trapezoid, or dual tips for it too.

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2004 GTP COMP G
K&N Intake, MPS, 3.5, Overkill PCM, SLP Powerflo, GTX Tips, SLP Headers, SLP Cat, 180 tstat, MSD Coils
Aeroforce Interceptor, Tints, 17" Elbrus Wheels

I found this on YouTube [ sounds pretty good]:

http://www.youtube.com/watch?v=JOlN2Rz5x60&feature=fvsr

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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!

oh yes it does but it will not be quite like stock lol

i would go for magnflow or SLP both are good

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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 problem I have right now is that my stock system isn't exactly whisper quiet either.
It really never was.
I'm just curious how much noisier than stock the Mag' is and under what conditions?

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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!

idle and cruise it seems to be a little louder not much but smoother sounding not as harsh. and then screams like a banshee at WOT

i wish the GTX was running becuase it's exhuast system would be a good example. it has stock muffs but the glasspack realy smoothed out the sound and cut down on rasp at speed

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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

That's kind of the sense I got from the video.
I think that may be a winner,if nothing better pops up.

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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!

SLP!

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2006 Subaru Impreza WRX STi My Build Thread
2004 Grand Prix GT2 : September 2011 GPONA COTM : SOLD
1997 Grand Prix GT1 : SOLD

I'd get the GMPP setup, IIRC it's a CORSA, I believe this is what is used on the new SS Impala. My neighbor has one of these and it sounds great. The magna flow system sounds good, but it seems a little louder than the rest.

Stay away from the BORLA, the cursing drone is un-real.

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Under Construction

Laura (stkks) has a Corsa setup on her '04 CompG. To me that is the best sound I've heard on a GP. It has a mild to moderately deeper tone over stock with no observed "raspyness". If I had extra $ for it i would buy those. I'll post a link of a video I took of her on the dyno.

https://www.youtube.com/watch?v=cbS5rHq ... ata_player (sounds better one I walked to the rear)

DX on too many different ROMs to keep updating my sig - via Tapatalk

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So the new Impy SS uses the GMPP exhaust ?
Does that exhaust bolt right up to our cars?
I did like the sound of the Corsa,but finding it in Canada can be difficult from what I've seen.

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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!

Corsa or Gmpp if your going full exhaust. Question...why go full exhaust. You know u can have $$$ and just replace mufflers w/ something of your choosing. The only major flaw w/ our exhaust is the manifolds but our stock exhaust are good till around 300hp+ when there's a lack in flow.

I have not heard personally the whole Borla system now I personally swapped out mufflers w/ Borla pros and there is absolutely no drone at all and kept stock resonator.

If it was my $$ would personally go with speeddaddy headers + your choice in mufflers and either keep stock resonator or replace w/ glasspack. Probably run around $450 or so together and headers will give that high end torque and mufflers of course will give you your desired sound. Food for thought since it wasn't mentioned

Sent from my Samsung Infuse

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I ran 3" stainless (run 2.75" if you want it quieter) with a Magnaflow straight through muffler where the cat was, I think it was 24" long with a 5" body, and another Magnaflow muffler back where the regular muffler was, though I don't remember which one or anything.

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One Big Ass Mistake America

Interesting ideas.
I need a full system.
I did find this:

http://www.corsaperf.com/product_displa ... roduct=631

I wonder why It's not listed for the GP?

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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!

I know the cat-back systems were the same for the 97-03 cars.

here's a link to the GMPP setup

http://www.gmpartsdirect.com/results.cf ... r=12498617


IIRC the 97-03 cat-back will fit on the 04+ but there's two hangers that don't line up right.

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Under Construction

Idk but im thinking they prob dont make them anymore?

link to where 3800performance sells it if your wondering...

http://www.3800performance.com/Merchant ... ct_Count=5

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2004 GTP COMP G
K&N Intake, MPS, 3.5, Overkill PCM, SLP Powerflo, GTX Tips, SLP Headers, SLP Cat, 180 tstat, MSD Coils
Aeroforce Interceptor, Tints, 17" Elbrus Wheels

The GMPP has been discontinued. It is said that it is the magnaflow cat back. I have had my borla on my 99 for 10 years. The drone is not bad. It is the best sounding of the bunch. I got mine when they were $500. My brother has the slp powerflo on his 03 and it has a good sound to it. The drone is a little louder than the borla. It is a good cat back for the price.

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1999 GT|SLP CAI|Borla Catback| Shift kit|18" Koblenz|GMPP Lowering|GMPP handling|Blk Headlights|ER Rcokers|HV3|HV TB http://www.fquick.com/The_Guz

don't get zzp it's loud as kcuf
but in reality the zzp is the closest sounding to stock at idle

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i have a borla and love it. not to loud until u get on it then its a pretty good rumble.


http://youtu.be/IHnX25BegYc

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The ZZP one isn't too terrible if you swap out the resonator with a magnaflow one. But there are better options for cheaper available. Believe it or not the pacesetter cat back is pretty nice and one of the more affordable options too.

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well my catback didn't come w/ a res. so there is a cherry bomb in place from the previous owner. but it still is loud as kcuf over idle but hardly any rasp

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Looks like I'm going Magnaflow with the resonator.
I priced out the Corsa and they wanted $1,700+ vs. $900 installed for the Magnaflow.
I'll let you know how it sounds after the install.

-- Tue Nov 01, 2011 6:44 pm --

I got the exhaust installed.
It's a Magnaflow 16726 - for a G/P GXP,IIRC.
The drone at 2,500 rpm is annoying [it rattled my brain at first].
It will drone up to around 3,500 rpm.
The funny thing is it settles right down everywhere else.
Hmmm.
I *think* it's due to the resonator ... I'm "guessing" it's tuned for the 5.3 V8 [makes sense].
That accounts for the "drony" areas where everywhere else seems pretty darned reasonable.
I like it except for the drone so I will see tomorrow about a proper V6 resonator.
I also bought some Goodyear Assurance triple tread tires.
I trust they're as good as some of you guys have said.

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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!