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Magnaflow Performance Exhaust
Thread Starter
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
Magnaflow Performance Exhaust
Most of you know I installed the MPE in my LT4 Vette. This system has a "X" then the resonator which has another "X" inside then out to the rear mufflers. It sounds great and it has a great rumble but, yesterday I drove to Los Angeles and this thing it's getting louder and with lots of resonance inside (AND, I installed sound deadener and undercoating). Needless to say I could not enjoy the radio.
I read other members' threads and they removed the resonator and the resonance went away. If I remove the resonator, will this help?
Imagine how loud this would be with long tubes
I read other members' threads and they removed the resonator and the resonance went away. If I remove the resonator, will this help?
Imagine how loud this would be with long tubes
Le Mans Master
Joined: Dec 2006
Posts: 5,139
Likes: 482
From: H-Town Texas
Just a couple of thoughts.
First check the hangers, are they set up to absorb vibration and shock like the springed stock hangers?
I really don't understand the double x-pipe on the system. I know that an x-pipe causes sounds to run into each other with the goal of cancelling out the more unpleasant sounds. I don't know if having two creates a double negative effect?
My personal set-up is the stock system with the Magnaflow resonator going out through straight pipes in the rear with stock tips. I am not experiencing any troubles with resonance or drone, but yes I can definitely hear the exhaust. The one thing I did notice in your pic was that your tips seem to be flush under the bumper cover. Mine are about a 1/2 inch out and point slightly downward. I'm not positive, but maybe this could make a difference?
First check the hangers, are they set up to absorb vibration and shock like the springed stock hangers?
I really don't understand the double x-pipe on the system. I know that an x-pipe causes sounds to run into each other with the goal of cancelling out the more unpleasant sounds. I don't know if having two creates a double negative effect?
My personal set-up is the stock system with the Magnaflow resonator going out through straight pipes in the rear with stock tips. I am not experiencing any troubles with resonance or drone, but yes I can definitely hear the exhaust. The one thing I did notice in your pic was that your tips seem to be flush under the bumper cover. Mine are about a 1/2 inch out and point slightly downward. I'm not positive, but maybe this could make a difference?
Last edited by lt4obsesses; Jan 11, 2010 at 10:12 AM.
Thread Starter
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
Just a couple of thoughts.
First check the hangers, are they set up to absorb vibration and shock like the springed stock hangers?
I really don't understand the double x-pipe on the system. I know that an x-pipe causes sounds to run into each other with the goal of cancelling out the more unpleasant sounds. I don't know if having two creates a double negative effect?
My personal set-up is the stock system with the Magnaflow resonator going out through straight pipes in the rear with stock tips. I am not experiencing any troubles with resonance or drone, but yes I can definitely hear the exhaust. The one thing I did notice in your pic was that your tips seem to be flush under the bumper cover. Mine are about a 1/2 inch out and point slightly downward. I'm not positive, but maybe this could make a difference?
First check the hangers, are they set up to absorb vibration and shock like the springed stock hangers?
I really don't understand the double x-pipe on the system. I know that an x-pipe causes sounds to run into each other with the goal of cancelling out the more unpleasant sounds. I don't know if having two creates a double negative effect?
My personal set-up is the stock system with the Magnaflow resonator going out through straight pipes in the rear with stock tips. I am not experiencing any troubles with resonance or drone, but yes I can definitely hear the exhaust. The one thing I did notice in your pic was that your tips seem to be flush under the bumper cover. Mine are about a 1/2 inch out and point slightly downward. I'm not positive, but maybe this could make a difference?
The tips are fully extended now. In that picture they were flushed but now the extend pass the rear bumper. Not a lot because the mufflers come with a welded bracket and the extension is limited by it.
The resonator is a bit to the left but it is not touching the seatbelt bolt. I cut the tip of it to give it extra space.
Maybe this son of a bitch is meant to be that loud. Sounds beautiful at 5,500 RPMS
Team Owner
Joined: Jan 2009
Posts: 73,568
Likes: 33
From: Somewhere in Mo
St. Jude Donor '09-'10, '14
maybe it is! Anyway to get a video of it so others who have this system can give you an idea?I know shakedown just installed a new magnaflow system on his. He has a clip of it in case you haven't seen/heard it.
Burning Brakes
Joined: Oct 2009
Posts: 773
Likes: 2
From: Minneapolis MN
The tips are fully extended now. In that picture they were flushed but now the extend pass the rear bumper. Not a lot because the mufflers come with a welded bracket and the extension is limited by it.
The resonator is a bit to the left but it is not touching the seatbelt bolt. I cut the tip of it to give it extra space.
Maybe this son of a bitch is meant to be that loud. Sounds beautiful at 5,500 RPMS
The resonator is a bit to the left but it is not touching the seatbelt bolt. I cut the tip of it to give it extra space.
Maybe this son of a bitch is meant to be that loud. Sounds beautiful at 5,500 RPMS
My advice is for you to trade your vette for mine & you will no longer have resonance issues
Enjoy your car the way it is or invest in some corsa exhaust which should improve resonance problem,but remember you have a badass & powerful engine which has LT headers & a larger performance engine build.You have another car(DD) which I'm sure is quiet.Your car is a toy & will have to sacrifice some things for a higher performing car(suspension,engine,etc).Offer still stands:o
Thread Starter
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
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Drifting
Joined: Aug 2009
Posts: 1,972
Likes: 243
I have the 3" Magnaflow system on my 94 - which is I believe the same system the OP has. Mine doesn't really resonate at all inside the car. However, the resonator does come dangerously close to a bolt on the drivers side and as mentioned in the quote above that could cause some serious interior resonance. I believe someone in this thread suggested it was the seatbolt - that I cannot verify.
I put a small piece of heater hose over the bolt to ensure that I would not have metal on metal contact. I'll have to check on it next time I am under the car.
I love the sound. It isn't obnoxious around town but open it up and it is pretty sweet note. I kept the cats on.
I put a small piece of heater hose over the bolt to ensure that I would not have metal on metal contact. I'll have to check on it next time I am under the car.
I love the sound. It isn't obnoxious around town but open it up and it is pretty sweet note. I kept the cats on.
Pro
Joined: Aug 2007
Posts: 623
Likes: 0
From: BGM NY
As for the sound, stick with it my man
. I have one of the best sounding C4's around
. It cost me dearly, but worth every $$$$
Also, I have dual straight all the wayyyyyyyyyy back with 4" tip Mags
. I have one of the best sounding C4's around. It cost me dearly, but worth every $$$$ Also, I have dual straight all the wayyyyyyyyyy back with 4" tip Mags
Last edited by VETTEHIGH; Jan 12, 2010 at 12:50 PM.
Thread Starter
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
UPDATE
Last weekend I found out the problem.
The 3" Magnaflow pipe is wider/bigger than stock. It was totally against the transmission bracket. I used the most demanding tool in any shop or garage in the world...a hammer and wrapped the pipe with "thermo wrap". Now, all the nasty resonance is gone. Quieter but enjoyable.
Last weekend I found out the problem.
The 3" Magnaflow pipe is wider/bigger than stock. It was totally against the transmission bracket. I used the most demanding tool in any shop or garage in the world...a hammer and wrapped the pipe with "thermo wrap". Now, all the nasty resonance is gone. Quieter but enjoyable.
Team Owner
Joined: Jan 2009
Posts: 73,568
Likes: 33
From: Somewhere in Mo
St. Jude Donor '09-'10, '14
UPDATE
Last weekend I found out the problem.
The 3" Magnaflow pipe is wider/bigger than stock. It was totally against the transmission bracket. I used the most demanding tool in any shop or garage in the world...a hammer and wrapped the pipe with "thermo wrap". Now, all the nasty resonance is gone. Quieter but enjoyable.
Last weekend I found out the problem.
The 3" Magnaflow pipe is wider/bigger than stock. It was totally against the transmission bracket. I used the most demanding tool in any shop or garage in the world...a hammer and wrapped the pipe with "thermo wrap". Now, all the nasty resonance is gone. Quieter but enjoyable.
Glad you got that figured out. bet that baby hums now.
Instructor
Joined: Jul 2004
Posts: 228
Likes: 1
From: Oakwood GA
UPDATE
Last weekend I found out the problem.
The 3" Magnaflow pipe is wider/bigger than stock. It was totally against the transmission bracket. I used the most demanding tool in any shop or garage in the world...a hammer and wrapped the pipe with "thermo wrap". Now, all the nasty resonance is gone. Quieter but enjoyable.
Last weekend I found out the problem.
The 3" Magnaflow pipe is wider/bigger than stock. It was totally against the transmission bracket. I used the most demanding tool in any shop or garage in the world...a hammer and wrapped the pipe with "thermo wrap". Now, all the nasty resonance is gone. Quieter but enjoyable.
Thread Starter
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
Glad to hear you found the problem.I too have a '96 LT-4 CE and Im thinking about going with the same sys you did. Bang for the buck it seams to be the best out there IMOP.My car is stock with a PCMforless tune. Will I notice a perf gain with the sys or is it strictly sound and looks? Either way doesnt matter just curious....ANY regrets?
Melting Slicks
Joined: Mar 2008
Posts: 3,022
Likes: 3
From: Chandler Arizona
I've got the same system. it's stainless steel, 3" diameter with an integrated x-pipe for little money! I have no complaints. No huge power gains, but with the corvette tax on most aftermarket items, this exhaust system is a bargain!
Thread Starter
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20