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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 08-09-2009, 11:00 AM   #1
chevyridinghigh
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GMPP Exhaust Reviews

Just wanted some reviews on the GMPP exhaust. I am thinking about going for the higher sound, hoping it's not too loud. Did you go for the lower or higher sounding one? Thanks.
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Old 08-09-2009, 11:49 AM   #2
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We just installed the offroad GMPP on a customer car....I find it better sounding than stock, and FAR from obnoxious sounding. This is what I'd roll!

Had another customer stop Saturday to look at it - he liked it too, and found it hard to believe it was the "off road" version. What he DID like, is you won't see those big pan mufflers that come on the car from the factory any more.

Again, Dave in our parts have them ready to ship out at a camaro5 discount.

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Old 08-09-2009, 12:57 PM   #3
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We just installed the offroad GMPP on a customer car....I find it better sounding than stock, and FAR from obnoxious sounding. This is what I'd roll!

Had another customer stop Saturday to look at it - he liked it too, and found it hard to believe it was the "off road" version. What he DID like, is you can see those big pan mufflers that come on the car from the factory.

Again, Dave in our parts have them ready to ship out at a camaro5 discount.
I thought the jerry can mufflers would be taken out with axleback exhausts? Is that not the case?
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Old 08-09-2009, 01:31 PM   #4
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I thought the jerry can mufflers would be taken out with axleback exhausts? Is that not the case?
That was a typo. He ment to say it gets rid of those big ulgy cans. The tips are also 4.5'' on the GMMP exhausts.
Pics of GMPP "off road" version.

http://www.camaro5.com/forums/showthread.php?t=34754
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Old 08-09-2009, 01:45 PM   #5
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Soooo then all the GMPP exhausts are axle-back and provide no power gains whatsoever?
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Old 08-09-2009, 01:51 PM   #6
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Soooo then all the GMPP exhausts are axle-back and provide no power gains whatsoever?
They should make a few HP, especially on the L99 A6. The L99 A6 uses a different muffer than the LS3's. They looks the same on the outside but when you cut them open, they're very different.
The LS3 mufflers are a straight through design with some packing material. The L99 mufflers are all crazy looking on the inside with more packing material.

My GMPP "off road" axle back has a 100% staight through design. Its a straight shot in and out the other side. So it should be worth a few HP. Its also much lighter than the stock mufflers.
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Old 08-09-2009, 01:53 PM   #7
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Hmm...so it's GMPP axle back for $900, or aftermarket cat-back for $1100--give or take.
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Old 08-09-2009, 01:58 PM   #8
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Hmm...so it's GMPP axle back for $900, or aftermarket cat-back for $1100--give or take.
You might call around and find it cheaper. I got mine (gmpartsdirect) for $724 total. I believe it was $661 before shipping and handling.
But the last I checked they had raised the price a bit.
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Old 08-09-2009, 02:12 PM   #9
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Hmm...so it's GMPP axle back for $900, or aftermarket cat-back for $1100--give or take.
Borla axle back can be had for 600 shipped And is basically the same, borla makes the gmpp setups too. GMPP stuff is usually just like aftermarket but marked up so you can call it GMPP.
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Old 08-09-2009, 03:31 PM   #10
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Borla axle back can be had for 600 shipped And is basically the same, borla makes the gmpp setups too. GMPP stuff is usually just like aftermarket but marked up so you can call it GMPP.
From what I've seen and heard, (GMPP "off road") and (Borla -mufflered) are the pretty much the same. The only real difference is the tips. With the GMPP you get a different design and shape with the tips, plus the bowtie emblems on the tips.
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Old 08-09-2009, 05:26 PM   #11
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They sound better than stock. That's for sure. I still didn't think they were very loud. Mufflers gone= best part. GMPP Exhaust+NOWEEDS!
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Old 08-09-2009, 09:53 PM   #12
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SCOTTY what would the GMPP axle back cost?
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Old 08-09-2009, 09:59 PM   #13
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I have the STREET version on the gmpp axle backs sitting in the box. It's ALMOST a straight thru path, VERY small curve in the can. Looks to like the only difference between off road and street is that the street has more packing. No crazy baffles or anything like that.

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Old 08-09-2009, 10:01 PM   #14
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Well...I don't think I would spend 6-700 dollars just for sound is the thing. I may end up just staying stock and working on cosmetics first until I get around to feeling okay with an intake/full exhaust/tune.

So I guess I'll do the tint, painted stripes, and then perhaps look at suspension upgrades since those don't affect the drivetrain warranty.
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Old 08-09-2009, 11:05 PM   #15
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Off-road GMPP exhaust street legal?

How do I find out if the GMPP off-road exhaust is street legal or not? What makes it street legal? Is it about sound or emission issues? I'm not very knowledgeable about this stuff so forgive me if these questions seem dumb.

I live in DC an would like to get the off-road version because I think it sounds better than the street version but I do not want something that I could get a ticket for or make me fail emissions.

Don't really know what to do hear.
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Old 08-10-2009, 10:00 AM   #16
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Quote:
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SCOTTY what would the GMPP axle back cost?
http://www.camaro5.com/forums/showth...t=gmpp+exhaust
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Old 08-10-2009, 10:32 AM   #17
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You might call around and find it cheaper. I got mine (gmpartsdirect) for $724 total. I believe it was $661 before shipping and handling.
But the last I checked they had raised the price a bit.
Yeah......to $883 including shiping ($145!!!!).
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Old 08-10-2009, 10:34 AM   #18
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What would be the "typical" installation charge be at a dealership? (I know they are all different), but a ballpark figure would help. THANKS!!!
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Old 08-10-2009, 10:42 AM   #19
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Took about an hour.....so what ever an hour of labor goes for in your area... $100?

Or less if you're crafty with a tube cutter or hacksaw!
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Old 08-10-2009, 10:45 AM   #20
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Man I wish they would've made this a cat-back. It would have made it so much easier (assuming there's some bolts that could be used...no car yet :()
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Old 08-10-2009, 11:05 AM   #21
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How do I find out if the GMPP off-road exhaust is street legal or not? What makes it street legal? Is it about sound or emission issues? I'm not very knowledgeable about this stuff so forgive me if these questions seem dumb.

I live in DC an would like to get the off-road version because I think it sounds better than the street version but I do not want something that I could get a ticket for or make me fail emissions.

Don't really know what to do hear.


Here you go, http://www.gmpartsdirect.com/results...umber=92231570

It says emissions-legal.. so it must be sound. I personally like loud exhaust so this might be a good option for me.
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Old 08-10-2009, 12:23 PM   #22
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Yeah......to $883 including shiping ($145!!!!).

145.00 for shipping....
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Old 08-10-2009, 01:20 PM   #23
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Took about an hour.....so what ever an hour of labor goes for in your area... $100?

Or less if you're crafty with a tube cutter or hacksaw!
THANKS Sir Scotty!!

Since I'm a girl (& have never done anything like this, at all - not that I couldn't, tho) & my hubby doesn't sound too interested in crawling under the car...(that is if he/we COULD get under it) not sure we could do it ourselves... but it's a thought!!

THANKS again!! You Rock!!
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Old 08-10-2009, 01:26 PM   #24
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I seen the install. You cut the pipes in two easy to get at spots. The Track pack is not loud...but it is much better than stock! I don't know why someone would by the other version....

It is "off road" because of smog, not emmissions....so consider it "off road" in California.

And Dave just told me of an insane deal on them....Seriously, he's been blowing these out! I would call him after you get their "our price is the lowest on cam5" price Too low to publish....sorry competitors !
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Old 08-13-2009, 11:32 PM   #25
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The Track pack is not loud...but it is much better than stock! I don't know why someone would by the other version....
Do you know if there is a sound and noise level difference between the Manual and Auto with the Off-Road version?
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