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Old 05-06-2013, 12:26 PM   #1
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muffler delete bad ?

hey guys my bro wants to delete his mufflers on his 01 gt. the guy who was gona do it said its bad for the engine if he does ? is this true ?
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Old 05-06-2013, 12:35 PM   #2
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hey guys my bro wants to delete his mufflers on his 01 gt. the guy who was gona do it said its bad for the engine if he does ? is this true ?
Heck no, that's what I got. It's a Flowmaster muffler delete, which is essentially pipe and Flowmaster tips. I am still running with my stock H pipe w/cats. It would probably just be too loud it he has an off road H or X pipe.
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Old 05-06-2013, 12:41 PM   #3
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The guy doing it is unwise in the way of cars.
I'd guess he is worried about a drop in backpressure, but there's no harm in deleting them.
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Old 05-06-2013, 12:45 PM   #4
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No problem at all
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Old 05-06-2013, 12:53 PM   #5
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awesome thannks guys
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Old 05-20-2013, 12:49 AM   #6
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I say

I did this, deleted two cats and mufflers and got new tips. In love with the sound.

Pic during the install
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Old 05-20-2013, 02:36 AM   #7
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What size tips did you get mike?
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Old 05-20-2013, 03:46 AM   #8
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What size tips did you get mike?

3'' tips, replaced them because they were pretty much in bad shape


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Old 05-20-2013, 05:30 AM   #9
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If he thinks that's bad what would he think about all the people with off road x or h with slp lm1s?? These motors can handle little back pressure better than most other motors and still make great power
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Old 05-20-2013, 06:11 AM   #10
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From what I've read having not enough back pressure will actually reduce torque a little but I don't remember where I read it to show you. Nor do I have Dyno numbers
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Old 05-20-2013, 06:20 AM   #11
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From what I've read having not enough back pressure will actually reduce torque a little but I don't remember where I read it to show you. Nor do I have Dyno numbers
It does reduce torque but a gain in horsepower.
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Old 05-20-2013, 06:52 AM   #12
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I'd rather the torque lol I run shorty headers off road h pipe bassani cat back with resonators no problem with torque
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Old 05-20-2013, 07:18 AM   #13
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hey guys my bro wants to delete his mufflers on his 01 gt. the guy who was gona do it said its bad for the engine if he does ? is this true ?
First of all don't let that man do any more car work for you!
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Old 05-20-2013, 08:46 AM   #14
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3'' tips, replaced them because they were pretty much in bad shape

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Old 05-20-2013, 10:35 AM   #15
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Back pressure myths 101:
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Old 05-22-2013, 12:53 PM   #16
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A gas motor needs some back pressure that's how it works. Desiel doesn't need it
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Old 05-22-2013, 01:01 PM   #17
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lol cliffy ftw
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Old 05-22-2013, 01:01 PM   #18
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Quote:
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A gas motor needs some back pressure that's how it works. Desiel doesn't need it
Look at a NASCAR. It runs 500 miles at 8000 rpm plus and it doesn't have any at all. Sure they are different but having little back pressure isn't all that bad
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Old 05-22-2013, 01:06 PM   #19
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Look at a NASCAR. It runs 500 miles at 8000 rpm plus and it doesn't have any at all. Sure they are different but having little back pressure isn't all that bad
Lol that was really irrelevant... NASCAR engines are incredibly built and can take the strain... That being Said it has 0 effect on the motor.
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Old 05-22-2013, 01:09 PM   #20
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Lol that was really irrelevant... NASCAR engines are incredibly built and can take the strain... That being Said it has 0 effect on the motor.
Also, they trash the motor after one race and completely rebuild it. They don't care if the lack of pressure destroys the motor.
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Old 05-22-2013, 01:15 PM   #21
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the cams on nascar engines..... lol
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Old 05-22-2013, 01:29 PM   #22
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Lol that was really irrelevant... NASCAR engines are incredibly built and can take the strain... That being Said it has 0 effect on the motor.
It kinda wasn't irrelevant seeing that it has no back pressure. I said they were different. And yes the cams are insane. The powerband is for 7000 to 9000. My point with the nascar comment is that if it hurt an engine that bad they wouldn't take a risk like that. You would see them with mufflers.
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Old 05-22-2013, 02:00 PM   #23
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A gas motor needs some back pressure that's how it works. Desiel doesn't need it
"Gas" motors do not need backpressure, you can find the complete explanation of why in the book Internal Combustion Engine Fundamentals by John Heywood. I had the privilege of studying with Dr. Heywood in the late 60s/early 70s...
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Old 05-22-2013, 02:34 PM   #24
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Back in the day, I had a bit of experience with hot rod boats. I've seen engines run many many hours with little to no backpressure. In extremely harsh environments I might add...
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Old 05-22-2013, 07:16 PM   #25
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Back in the day, I had a bit of experience with hot rod boats. I've seen engines run many many hours with little to no backpressure. In extremely harsh environments I might add...
Yes they may run just as long. You will lose hp and tq with no back pressure regardless of how long it lasts
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Old 05-22-2013, 07:26 PM   #26
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Yes they may run just as long. You will lose hp and tq with no back pressure regardless of how long it lasts
If that was true, I believe top fuel dragsters would have mufflers on top of the Zoomies. Please explain your theory...
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Old 05-22-2013, 08:10 PM   #27
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Yes they may run just as long. You will lose hp and tq with no back pressure regardless of how long it lasts
NO, read the articles in the links I provided above, and Dr. Heywood's book and you will come to understand how wrong that statement is. It is not loss of back pressure, but rather loss of exhaust gas velocity that reduces torque when piping gets too big...
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Old 05-22-2013, 08:40 PM   #28
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Not to mention sound like ***.
Really? Straight pipes?
Straight pipes w/o the benefit of some form of sound tuning sound like raspy, tinny, crap.
Magnaflow, Flowmaster, Borla, you name it, invest thousands of dollars in research trying to develop a unique sound signature, while at the same time do the job a muffled exhaust system is supposed to do. Research spent both in sound suppression, and balancing the right amount of restriction vs flow. If it was as easy as just not putting a muffler at all to get a great sounding exhaust,...seems there'd be a buttload of name branded replacement "test pipes" replacing perfectly good mufflers.

IMO The sound difference between somebody interested in a great sounding exhaust and a hollow tube defines the age of the driver.
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Old 05-22-2013, 08:56 PM   #29
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^, +1,000,000,000 or approximately 1/16,000th of the national debt...
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Old 05-22-2013, 09:09 PM   #30
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^, +1,000,000,000 or approximately 1/16,000th of the national debt...
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Old 05-22-2013, 09:13 PM   #31
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Not to mention sound like ***.
Really? Straight pipes?
Straight pipes w/o the benefit of some form of sound tuning sound like raspy, tinny, crap.
Magnaflow, Flowmaster, Borla, you name it, invest thousands of dollars in research trying to develop a unique sound signature, while at the same time do the job a muffled exhaust system is supposed to do. Research spent both in sound suppression, and balancing the right amount of restriction vs flow. If it was as easy as just not putting a muffler at all to get a great sounding exhaust,...seems there'd be a buttload of name branded replacement "test pipes" replacing perfectly good mufflers.

IMO The sound difference between somebody interested in a great sounding exhaust and a hollow tube defines the age of the driver.
Mike, you hit it spot on.
There's a difference between toneless noise and a refined loud exhaust.
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Old 05-22-2013, 09:20 PM   #32
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I wish all y'all would run straight pipes so those of us with exhaust can dust you in quarter mile
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Old 05-22-2013, 09:27 PM   #33
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I wish all y'all would run straight pipes so those of us with exhaust can dust you in quarter mile
Most drag cars run open headers and they will dust you... Most of those cars will run faster with a free flowing exhaust like that than a complete system. I was running a 13.4 with my flows and now I basically have "straight pipes"(off road x and slp lm1) and I run a 13.1. That's all that I have changed so obviously a free flowing exhaust is faster.
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Old 05-22-2013, 09:35 PM   #34
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Most drag cars run open headers and they will dust you... Most of those cars will run faster with a free flowing exhaust like that than a complete system. I was running a 13.4 with my flows and now I basically have "straight pipes"(off road x and slp lm1) and I run a 13.1. That's all that I have changed so obviously a free flowing exhaust is faster.
Driver mod?
You've had more practice since then.
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Old 05-22-2013, 09:36 PM   #35
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Driver mod?
You've had more practice since then.
I did probably 100 passes with it with flows on it so I think I had it down pat. I didn't change anything. Mph jumped up too
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