No mufflers
Thread Starter
Instructor
Joined: Sep 2004
Posts: 101
Likes: 0
From: Abilene Texas
No mufflers
I removed the tailpipes and mufflers at the rearmost flange and replaced the factory junk with straight pipes. 
Now my local expert (neighbor) tells me that I am going to have all kinds of engine problems because of a lack of back pressure. 
Could ya'll provide a few answers so I can print them out and let him know that running only catalytic converters and no mufflers will harm nothing??? 
Thanx, Mike
Now my local expert (neighbor) tells me that I am going to have all kinds of engine problems because of a lack of back pressure. Could ya'll provide a few answers so I can print them out and let him know that running only catalytic converters and no mufflers will harm nothing??? Thanx, Mike
Melting Slicks
Joined: Nov 2003
Posts: 3,396
Likes: 2
From: North Manchester Indiana
ok,,first, thell im to look at all the harleys with straigh pipes...
I have high flow cats, no mufflers and a blower, ain got no problems.
and ..I just bet most race cars dont have cats..lol...and most dont have mufflers (some do actually have them)....
the only aspect of his comment that is relevent, you should tune for a open, non restrictive exhaust,,,,
just the lenght of the c5 exhaust will create some back pressure, even if there are no mufflers..
your friend is WRONG......I have NEVER burnt a valve, fried a motor , blew a fuse or overheated a trans due to straight pipes. I have a straigh pipe on my tractor, my go kart, (allmost on the vette), and even straight pipes on my motorcycle. I have all sorts of problems
.....
(I like to hear the music of a good motor)
I have high flow cats, no mufflers and a blower, ain got no problems.
and ..I just bet most race cars dont have cats..lol...and most dont have mufflers (some do actually have them)....
the only aspect of his comment that is relevent, you should tune for a open, non restrictive exhaust,,,,
just the lenght of the c5 exhaust will create some back pressure, even if there are no mufflers..
your friend is WRONG......I have NEVER burnt a valve, fried a motor , blew a fuse or overheated a trans due to straight pipes. I have a straigh pipe on my tractor, my go kart, (allmost on the vette), and even straight pipes on my motorcycle. I have all sorts of problems
.....(I like to hear the music of a good motor)
Racer
Joined: Oct 2005
Posts: 257
Likes: 0
From: SF Bay Area (Norcal) California
I ran with cats but no mufflers for a long time (Corsa Ti system )
That guys is wrong. First of all there is plenty of backpressure in the exhaust. Even if you removed the cats, ran headers with 3 inch exhaust with no mufflers you'd still have enough backpressure. He's being an overzealous car guy. He knows his theories but didn't put them into practice correctly.
That guys is wrong. First of all there is plenty of backpressure in the exhaust. Even if you removed the cats, ran headers with 3 inch exhaust with no mufflers you'd still have enough backpressure. He's being an overzealous car guy. He knows his theories but didn't put them into practice correctly.
Le Mans Master
Joined: Oct 2001
Posts: 6,710
Likes: 2
From: Southern California
I've had SLP Loudmouths on for about 20,000 miles, and I'm absolutely sure they caused my fuel level sensors to go bad, stripped the gears on one of my headlights, and are directly responsible for the magnetic pole shift.
Pro
Joined: Dec 2003
Posts: 502
Likes: 1
From: Fountain hills AZ
Originally Posted by Dually Driver
I removed the tailpipes and mufflers at the rearmost flange and replaced the factory junk with straight pipes. Now my local expert (neighbor) tells me that I am going to have all kinds of engine problems because of a lack of back pressure. Could ya'll provide a few answers so I can print them out and let him know that running only catalytic converters and no mufflers will harm nothing???
Thanx, Mike
Now my local expert (neighbor) tells me that I am going to have all kinds of engine problems because of a lack of back pressure. Could ya'll provide a few answers so I can print them out and let him know that running only catalytic converters and no mufflers will harm nothing??? Thanx, Mike
Team Owner
Joined: Dec 2003
Posts: 21,849
Likes: 140
From: When all is said and done... there is a hell of a lot more said than done. Riverside,Texas
St. Jude Donor '05 thru '26
Originally Posted by Cole
Neighbor is wrong. But you probably can't hear him anyway.
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Melting Slicks
Joined: Dec 2005
Posts: 2,584
Likes: 176
From: The Hills of Ky
I had my mufflers removed about a year and half ago, so did a friend of mine.The only problem I had was my wife went thru the change of life the first time I really got on it after having it done.
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
Sounds like the local expert, who is always WRONG. WHat does he drive anyway? a Yugo, Honda or mini van??
I have TPIS LT, Random Tech Cats and 3" x-pipe with 3" straight pipes.
NO CODES, NO OBDII issues, - Less back pressure means more ponies
I have TPIS LT, Random Tech Cats and 3" x-pipe with 3" straight pipes.
NO CODES, NO OBDII issues, - Less back pressure means more ponies
Race Director
Joined: Jan 2003
Posts: 14,285
Likes: 0
From: Houston, Tx Got traction?
CI 5-6-7-8-9-10 Veteran
St. Jude Donor '07-'08
This motor needs bigger headers, no cats, and free flowing exhaust...to make any power. The stock mufflers aren't the most restrictive part of the exhaust, which is why mufflers are NOT a performance mod.
Chris
Chris
Safety Car
Joined: Jun 2005
Posts: 3,561
Likes: 33
From: Clark NJ
St. Jude Donor '05 thru '26
Up here in NY, the only problems I see would be passing the mandatory annual state inspection or getting too much attention from LEO….. but there are ways of getting past the inspection.
Last edited by Johnny_B_Good; Jan 1, 2006 at 05:21 PM.
Thread Starter
Instructor
Joined: Sep 2004
Posts: 101
Likes: 0
From: Abilene Texas
Thanx
Thanx for all the reading material for my neighbor. You're right about not really hearing him.. 
Batman has me really concerned about the magnetic pole shift!!! 
Seems I'm getting blamed for every derned thing these days... 
Mike
You're right about not really hearing him.. Batman has me really concerned about the magnetic pole shift!!! Seems I'm getting blamed for every derned thing these days... Mike
Melting Slicks
Joined: Jul 2005
Posts: 2,572
Likes: 3
From: Rehoboth MA . . . NRA Life Member
St. Jude Donor '06-'07
If what he's says is true, ask him to explain how all race cars run with open headers. 
I used to do allot of drag racing in the early and mid 70's, all with open headers. My times never increased with mufflers and I never damaged an engine.
The moral of the story is: never ask the greeter at WalMart what tires you should run at the track.
Bob
I used to do allot of drag racing in the early and mid 70's, all with open headers. My times never increased with mufflers and I never damaged an engine.
The moral of the story is: never ask the greeter at WalMart what tires you should run at the track.
Bob
Last edited by BobbyG; Jan 2, 2006 at 08:30 PM.