Drilling holes in exhaust
Thread Starter
Pro
Joined: Jan 2005
Posts: 697
Likes: 93
From: Somewhere in the OC, CA
Drilling holes in exhaust
A friend has a 2001 convertable, stock except for a K&N filter. He drilled 4 X 5/16 inch holes in each exhaust pipe at the curve just before the muffler. He liked the new sound and performance, ran for a few weeks, no problems.
I tried the same for my 2000, also stock except for a K&N filter, drilled 1 in each, then 2 and stopped there, as it was loud enough for me.
The car sounds meaner but not too loud, no resonance inside the car at all. Performance seem to be more torque at lower RPMs, but does not seem to get from 5-6K RPMs as easily (not that I care to be honest as I dont often run at 6K on the way to work)
Has anyone else done or thought of this? Does anyone know of any reason why this is a bad idea?
Thanks a lot - first time here and first thread posted.
I tried the same for my 2000, also stock except for a K&N filter, drilled 1 in each, then 2 and stopped there, as it was loud enough for me.
The car sounds meaner but not too loud, no resonance inside the car at all. Performance seem to be more torque at lower RPMs, but does not seem to get from 5-6K RPMs as easily (not that I care to be honest as I dont often run at 6K on the way to work)
Has anyone else done or thought of this? Does anyone know of any reason why this is a bad idea?
Thanks a lot - first time here and first thread posted.
Last edited by Florida2000; Jan 19, 2005 at 10:21 AM.
Thread Starter
Pro
Joined: Jan 2005
Posts: 697
Likes: 93
From: Somewhere in the OC, CA
Originally Posted by 90 droptop
Kind of a ghetto mod if you ask me. And I doubt 4 -5/16 holes will do anything for performance. The increase in TQ is in your head.
Pro
Joined: Nov 2003
Posts: 597
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From: You want HOW much for that Corvette part??? Atlanta GA
Originally Posted by 90 droptop
Kind of a ghetto mod if you ask me. And I doubt 4 -5/16 holes will do anything for performance. The increase in TQ is in your head.
welcome to the forum Florida2000. Keep an eye on the parts for sale section. you can find a good Ti exhaust or another muffler section that will give you sound, weight reduction and better flow without the "ghetto mod" stigma. once again, welcome.
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Team Owner
Joined: Mar 2001
Posts: 21,325
Likes: 3,841
From: small town in S.E Pa. PA
St. Jude Donor '03-'04
Four 5/16 holes?? in each?? that a total surface area of more than 2 1/2 inches. Can anyone say carbon monoxide poisoning. I can see sitting in traffic and getting a severe headache before nodding off for the last time.. 
Yeah Cut outs can be turned off when you sitting in traffic.Not a very smart move... Brain damage? This sounds like a NO Brainer to me....meaning you have NO brains
Yeah Cut outs can be turned off when you sitting in traffic.Not a very smart move... Brain damage? This sounds like a NO Brainer to me....meaning you have NO brains
Team Owner
Joined: Mar 1999
Posts: 28,753
Likes: 9
From: San Jose/Bear Valley CA
CA Events Coordinator
Originally Posted by Evil-Twin
Four 5/16 holes?? in each?? that a total surface area of more than 2 1/2 inches. Can anyone say carbon monoxide poisoning. I can see sitting in traffic and getting a severe headache before nodding off for the last time..
Yeah Cut outs can be turned off when you sitting in traffic.Not a very smart move... Brain damage? This sounds like a NO Brainer to me....meaning you have NO brains
Yeah Cut outs can be turned off when you sitting in traffic.Not a very smart move... Brain damage? This sounds like a NO Brainer to me....meaning you have NO brains
Should we do a before and after brain scan?? 
VR
Drifting
Joined: Jul 2002
Posts: 1,484
Likes: 0
From: Morgan Hill Ca.
Originally Posted by Evil-Twin
Was I too Harsh???? 
I am overly sensitive to people's feelings 
I am overly sensitive to people's feelings 
I would rather know the exhaust is going outside the car rather than under it.
Racer
Joined: Jun 2003
Posts: 256
Likes: 0
From: Newport Beach Ca
Similar in concept to the "A & A Exhaust Mod". That is -- some portion of the exhaust by-passes the muffler.
I doubt that you've created any significant safety risk. People have been drilling holes in mufflers for decades. However, it is potentially a risk.
If you like it -- great. If you decide you don't like it; weld the holes up.
I doubt that you've created any significant safety risk. People have been drilling holes in mufflers for decades. However, it is potentially a risk.
If you like it -- great. If you decide you don't like it; weld the holes up.
Team Owner
Joined: Mar 2001
Posts: 21,325
Likes: 3,841
From: small town in S.E Pa. PA
St. Jude Donor '03-'04
Originally Posted by Bruceatlam
Similar in concept to the "A & A Exhaust Mod". That is -- some portion of the exhaust by-passes the muffler.
I doubt that you've created any significant safety risk. People have been drilling holes in mufflers for decades. However, it is potentially a risk.
If you like it -- great. If you decide you don't like it; weld the holes up.
I doubt that you've created any significant safety risk. People have been drilling holes in mufflers for decades. However, it is potentially a risk.
If you like it -- great. If you decide you don't like it; weld the holes up.
Team Owner
Joined: Jan 2003
Posts: 21,234
Likes: 19
From: Freestate Corvette Club! Elkridge, MD
St. Jude Donor '17
Originally Posted by Evil-Twin
Four 5/16 holes?? in each?? that a total surface area of more than 2 1/2 inches. Can anyone say carbon monoxide poisoning. I can see sitting in traffic and getting a severe headache before nodding off for the last time..
Yeah Cut outs can be turned off when you sitting in traffic.Not a very smart move... Brain damage? This sounds like a NO Brainer to me....meaning you have NO brains
Yeah Cut outs can be turned off when you sitting in traffic.Not a very smart move... Brain damage? This sounds like a NO Brainer to me....meaning you have NO brains
- you could end up as a contender for the Darwin Awards!
Le Mans Master
Joined: Jun 2004
Posts: 6,269
Likes: 50
From: Dallas Texas
St. Jude Donor '06-'07-'09-'10
Originally Posted by Evil-Twin
Was I too Harsh???? I am overly sensitive to people's feelings
I am overly sensitive to people's feelings Too harsh ? Wouldn't be E-T, if you weren't.
The mod sounds like the A&A muffler by-pass mod, but shortcut. I would think that it would make a whistling noise when you nailed it.
Melting Slicks
Joined: Aug 2000
Posts: 3,367
Likes: 0
Originally Posted by atl97vette
c'mon 90droptop, tell us what you're really thinking.
welcome to the forum Florida2000. Keep an eye on the parts for sale section. you can find a good Ti exhaust or another muffler section that will give you sound, weight reduction and better flow without the "ghetto mod" stigma. once again, welcome.
welcome to the forum Florida2000. Keep an eye on the parts for sale section. you can find a good Ti exhaust or another muffler section that will give you sound, weight reduction and better flow without the "ghetto mod" stigma. once again, welcome.
If I spoke my mind on some of the things I read on this board, I would be banned for sure.
Thread Starter
Pro
Joined: Jan 2005
Posts: 697
Likes: 93
From: Somewhere in the OC, CA
Originally Posted by Evil-Twin
Four 5/16 holes?? in each?? that a total surface area of more than 2 1/2 inches. Can anyone say carbon monoxide poisoning. I can see sitting in traffic and getting a severe headache before nodding off for the last time..
Yeah Cut outs can be turned off when you sitting in traffic.Not a very smart move... Brain damage? This sounds like a NO Brainer to me....meaning you have NO brains
Yeah Cut outs can be turned off when you sitting in traffic.Not a very smart move... Brain damage? This sounds like a NO Brainer to me....meaning you have NO brains
1) I live in Florida and have the top down 95% of the time. 2) the holes are drilled at the curve and exhaust is forced towards the back of the car and is very near rear anyway 4) I am more likely to get CO poisoning from the car in front of me if I'm sitting in traffic 5) CO carried inside by exhaust fumes is easily detectable, you'd taste and smell it, unlike CO produced by a gas heater in a home for example.
Anyway, it’s been a great experience so far at corvetteforum, the insults and sarcasm are much appreciated