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

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Old 08-08-2009, 09:54 PM   #1
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? for those with axle backs..Borla, GMPP, SLP, etc...

I have my Borla axle backs and it seems to get louder as time goes by....

but my question is, when I am slowing down and braking as the rpm levels drop, if they drop slow I get a popping sound from the exhaust at about 1500 rpm...seems to do it more in 4th gear...
is this popping normal with the axle backs? do any other have the same popping?

for those that have the GMPP touring (not offroad) do you have the same pop?


also do you guys have any drone? it seems to hum some at 75 mph and 6th gear, but any higher rpm's it goes away and if I drop to 5th it gets a little better

thanks
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Old 08-08-2009, 11:24 PM   #2
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It is normal and I just love it on our '03 Corvette!!
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Old 08-09-2009, 12:43 AM   #3
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yea the popping is normal, i have it with my mbrp catback on my challenger, and the nismo catback on my truck.

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Old 08-09-2009, 05:29 PM   #4
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Quote:
Originally Posted by Ltdodge View Post
I have my Borla axle backs and it seems to get louder as time goes by....

but my question is, when I am slowing down and braking as the rpm levels drop, if they drop slow I get a popping sound from the exhaust at about 1500 rpm...seems to do it more in 4th gear...
is this popping normal with the axle backs? do any other have the same popping?

for those that have the GMPP touring (not offroad) do you have the same pop?


also do you guys have any drone? it seems to hum some at 75 mph and 6th gear, but any higher rpm's it goes away and if I drop to 5th it gets a little better

thanks
I just installed SLP Loudmouth II's axle back and I get the same popping and occasional drone at certain rpm's, all is normal.
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Old 08-09-2009, 10:39 PM   #5
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yeah I did a muffler delete with straight pipes instead of SLP loudmouth I and love it, finally sounds like there is something under the hood. Same thing, some back pressure 'pops' at certain RPMs and it's LOUD at about 2k RPM.
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Old 08-10-2009, 08:49 AM   #6
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I'm not really a big fan of the popping sound. Does the complete cat back system cure this with any of the above emntioned systems? I have the SLP PowerFlo catback on my old Z28 with no popping. It never popped with or without headers either. I was hoping to go with the SLP II, but I might get the PowerFlo again or add a resenator on the x-pipe, I know Magnaflow has a resenator on the x-pipe to help this on their system, but I prefer the 300-series stainless steel the others offer.
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Old 08-11-2009, 10:10 AM   #7
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I wasn't a fan of the popping either... at first. After I got used to it though I actually started to like it. :-)
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Old 08-12-2009, 08:58 AM   #8
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I just got my SLP loudmouth 1 installed and I love it! The popping sounds are new to me but I'm already starting to like it!
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Old 08-12-2009, 09:55 AM   #9
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Normal, I am not getting any drone, just a nice note. M6 LMII
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Old 08-12-2009, 02:29 PM   #10
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SLP Loudmouth here...No drone, I love the popping...
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Old 08-12-2009, 02:58 PM   #11
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Hell, even the stock exhaust on my M6 SS has some decel popping at certain RPMs.
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Old 08-12-2009, 03:13 PM   #12
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Hell, even the stock exhaust on my M6 SS has some decel popping at certain RPMs.
Its a little lite but yes I hear it before as well.
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Old 08-12-2009, 06:31 PM   #13
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No drone on the SLP LMII, is that an axle back or cat back?
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Old 08-13-2009, 08:17 AM   #14
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toehead, slp 2 is a axle back. im like you, just dont know what i want yet. been doin a lot of research. im goin axle back for sure, i need the warranty. im torn between the slp 2 loudmouth and the gmpp street exhaust. i dont want any drone and no popping. well a pop here and there would be ok. question-will the gmpp cai improve the sound of the gmpp exhaust even more. the gmpp is just not quite loud enough for me. thx
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Old 08-13-2009, 10:06 AM   #15
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Quote:
Originally Posted by Ltdodge View Post
...but my question is, when I am slowing down and braking as the rpm levels drop, if they drop slow I get a popping sound from the exhaust at about 1500 rpm...seems to do it more in 4th gear...is this popping normal with the axle backs? do any other have the same popping?
I read somewhere on this forum, that many had this popping. But the popping seemed to go away with a dyno tune. Some saying once they got off the tune, no more. Might be worth a look?
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Old 08-13-2009, 10:16 AM   #16
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Yeah all the things you mentioned (poping, drone) those are all joys for aftermarket exhausts. As for your Borlas sounding louder. Do you have the s-type kit? If you do the mufflers are glass packs, and glass packs fill with carbon as you drive which fills in all the fiber glassm which basically turns everything solid and making it a straight pipe.
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Old 08-13-2009, 12:27 PM   #17
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Here is an explanation as to the cause of deceleration popping in some engines.
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Old 08-13-2009, 04:36 PM   #18
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What is the length of the SLP LMII muffler?? Is is a tight fit because SLP sells LMII mufflers separate but they look different and are 18-3/4" long. I'm thinking of ordering the pari for $200 and custom fabbing the rest of the exhaust.
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Old 08-13-2009, 05:44 PM   #19
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What is the length of the SLP LMII muffler?? Is is a tight fit because SLP sells LMII mufflers separate but they look different and are 18-3/4" long. I'm thinking of ordering the pari for $200 and custom fabbing the rest of the exhaust.
I was thinking of doing the same thing.I have the GFX and can't find a axel back to fit
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