Silenced the Borla Drone
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Drifting
Joined: Feb 2008
Posts: 1,682
Likes: 3
From: Coatesville PA
Drifting
Joined: Apr 2008
Posts: 1,815
Likes: 10
From: New York New York
I did research the point. I saw the thread where that guy cut open the Corsa and proved that on each muffler only 1 port is FULLY operational and the other one is slightly operational allowing only a minimal amount of exhaust to come out. He also proved this by blocking off the 2 fully operational ports and putting tissue paper on the 2 that had minimal exhaust coming out and proved that there was some exhaust coming out. Therefore, I did my research. I just wasn't clear on my post due to the fact that I didn't want to type all of this out.
This is a link to the thread I RESEARCHED but I do not think the videos work anymore. You can PM the guy and he can show you maybe.
http://forums.corvetteforum.com/c4-t...deo-proof.html
This is a link to the thread I RESEARCHED but I do not think the videos work anymore. You can PM the guy and he can show you maybe.
http://forums.corvetteforum.com/c4-t...deo-proof.html
Last edited by uptown193; Sep 14, 2010 at 05:25 PM.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
I did research the point. I saw the thread where that guy cut open the Corsa and proved that on each muffler only 1 port is FULLY operational and the other one is slightly operational allowing only a minimal amount of exhaust to come out. He also proved this by blocking off the 2 fully operational ports and putting tissue paper on the 2 that had minimal exhaust coming out and proved that there was some exhaust coming out. Therefore, I did my research. I just wasn't clear on my post due to the fact that I didn't want to type all of this out.
This is a link to the thread I RESEARCHED but I do not think the videos work anymore. You can PM the guy and he can show you maybe.
http://forums.corvetteforum.com/c4-t...deo-proof.html
This is a link to the thread I RESEARCHED but I do not think the videos work anymore. You can PM the guy and he can show you maybe.
http://forums.corvetteforum.com/c4-t...deo-proof.html
"[B]I saw the thread where that guy cut open the Corsa and proved that on each muffler only 1 port is FULLY operational and the other one is slightly operational allowing only a minimal amount of exhaust to come out."
So, we moved from 'only one outlet on each side works' TO 'only 1 port FULLY operational and the other one is slightly operational . . .'
I try to pay attention to what folks write and I can usually comprehend what's written. Many times, however, I find it about impossible to comprehend what they MEANT to write.
Jake
Drifting
Joined: Apr 2008
Posts: 1,815
Likes: 10
From: New York New York
I basically wrote that initially because the exhaust that does come out the outer tips of my Corsa is very close to nothing. In my latter post I got more specific. Sorry for any confusion I caused anyone.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
Here's my Corsa video again.
I don't know what's so, hard to understand?
The Inner tips flow straight through.
The Outer tips are not Fake, Dummy, Decorative or Just For Looks, they are exhaust tips that let a tiny bit of exhaust gas exit for Whatever Reason which make the Corsa's Sound Great and be Droneless.
Here's the video.
To the OP, measure your 0-60 mph times with an iphone "Dynolicious" Ap or "G Tech" to find out how much HP loss with the one Borla Tip plugged.
I don't know what's so, hard to understand?
The Inner tips flow straight through.
The Outer tips are not Fake, Dummy, Decorative or Just For Looks, they are exhaust tips that let a tiny bit of exhaust gas exit for Whatever Reason which make the Corsa's Sound Great and be Droneless.
Here's the video.
To the OP, measure your 0-60 mph times with an iphone "Dynolicious" Ap or "G Tech" to find out how much HP loss with the one Borla Tip plugged.
Last edited by GKK; Sep 15, 2010 at 12:44 PM.
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
old news as far as the plug goes....but I'm glad it worked for you
http://forums.corvetteforum.com/c4-t...agnaflows.html
http://forums.corvetteforum.com/c4-t...agnaflows.html
Drifting
Joined: Apr 2008
Posts: 1,815
Likes: 10
From: New York New York
I didn't believe it until I tried it... plugging one of the tips exiting the Borla muffler cut exhaust noise and drone dramatically! I bought two 2" pipe plugs, had to rework them a bit, and tightened them into the two inside pipes. I am truly amazed at the noise reduction! Was a little concerned that the plastic plug would melt, but since no exhaust is flowing through the pipe, the tip is barely warm. The car is so quiet now I'm hearing all the squeaks and rattles and would almost like it a little louder!
1) Can this damage the engine or mufflers in any way?
2) Any idea how much of a power loss I'll get plugging one of the tips?
3) Has anyone used a preforated restrictor pipe inside one or both of the tips to reduce drone but preserve the rumble?
1) Can this damage the engine or mufflers in any way?
2) Any idea how much of a power loss I'll get plugging one of the tips?
3) Has anyone used a preforated restrictor pipe inside one or both of the tips to reduce drone but preserve the rumble?
Thread Starter
Instructor
Joined: Jun 2004
Posts: 247
Likes: 0
From: Derry nh
Why not plug it one tip completely? Maybe something to do with allowing moisture inside the muffler up to the plugged tip to evaporate?
If plugged completely, the tip stays pretty cool since no exhaust escapes and low-temp materials can be used for the plug. If partially open, the restrictions need to be able to handle the full heat of the exhaust gas.
I tried some washers with 3/4" holes to partially close the inside tips but that didn't cut noise and drone by much. Perhaps washers with a smaller hole and/or some SS wool stuffed in the tube upstream of the washer would let out moisture but be a little quieter.
If plugged completely, the tip stays pretty cool since no exhaust escapes and low-temp materials can be used for the plug. If partially open, the restrictions need to be able to handle the full heat of the exhaust gas.
I tried some washers with 3/4" holes to partially close the inside tips but that didn't cut noise and drone by much. Perhaps washers with a smaller hole and/or some SS wool stuffed in the tube upstream of the washer would let out moisture but be a little quieter.
Burning Brakes
Joined: Mar 2005
Posts: 800
Likes: 2
So my dynomax super turbo mufflers are as good as the corsa? most of my exhaust only comes out of one tip, some comes out other, but no where near as much, and it doesn't drone in the car at any rpm... They aren't $1300 either.. 
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Drifting
Joined: Apr 2008
Posts: 1,815
Likes: 10
From: New York New York
Seems like they are as long as they are 100% stainless steel and sound the same. Other than that yes.
Instructor
Joined: Mar 2012
Posts: 128
Likes: 1
Hey, has anyone tried these Venturi parts on a c5 (or other vette) to silence the Borla drone? If so, where did you install them in the exhaust and what were your results like?
http://www.tundrasolutions.com/forum...rla-drone-fix/
http://techtonicstuning.com/main/ind...roducts_id=759
http://www.tundrasolutions.com/forum...rla-drone-fix/
http://techtonicstuning.com/main/ind...roducts_id=759
Le Mans Master
Joined: Oct 2004
Posts: 7,706
Likes: 485
From: Everett WA
C4 of Year Finalist (appearance mods) 2019
From his post is was VERY CLEAR that one of the outlets of each muffler was nearly plugged -- but not completely so -- and it was felt that this was one of the engineering aspects that lead to the CORSA being the only aftermarket LT1 dual exhaust system with no drone.
