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Old 10-27-2012, 11:29 PM   #1
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Cats delete need advice and opinions?

Wanting to delete my cats I have basini xpipe and flowmaster thunder cat exhaust I've heard it's ok to do that as long as u keep flowmaster on for back pressure?
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Old 10-27-2012, 11:38 PM   #2
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Quote:
Originally Posted by M97cobra
Wanting to delete my cats I have basini xpipe and flowmaster thunder cat exhaust I've heard it's ok to do that as long as u keep flowmaster on for back pressure?
Do you have stock manifolds if so you will be fine
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Old 10-27-2012, 11:44 PM   #3
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Quote:
Originally Posted by M97cobra
Wanting to delete my cats I have basini xpipe and flowmaster thunder cat exhaust I've heard it's ok to do that as long as u keep flowmaster on for back pressure?
Back Pressure is a myth!.. It is not needed!.. Know a guy with a '99 Cobra, LTs, O/R X-Pipe, and no mufflers!.. Has zero problems!..
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Old 10-27-2012, 11:51 PM   #4
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Originally Posted by Eturner

Back Pressure is a myth!.. It is not needed!.. Know a guy with a '99 Cobra, LTs, O/R X-Pipe, and no mufflers!.. Has zero problems!..
+1
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Old 10-28-2012, 07:18 AM   #5
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Wanting to delete my cats I have basini xpipe and flowmaster thunder cat exhaust I've heard it's ok to do that as long as u keep flowmaster on for back pressure?
Here's some info on backpressure.

Myths about "back-pressure"
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Old 10-28-2012, 07:21 AM   #6
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Originally Posted by Eturner

Back Pressure is a myth!.. It is not needed!.. Know a guy with a '99 Cobra, LTs, O/R X-Pipe, and no mufflers!.. Has zero problems!..
Except hearing problems
And poor taste
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Old 10-28-2012, 01:14 PM   #7
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Quote:
Originally Posted by Trojan Horse

Here's some info on backpressure.

Myths about "back-pressure"
Lol who started that thread?!?....

---------- Post added at 12:14 PM ---------- Previous post was at 12:13 PM ----------

Quote:
Originally Posted by deadsp0t

Except hearing problems
And poor taste
What?!?!?.... Sorry I can't hear you!!... My exhaust is to loud and awesome!!.... Lol
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Old 10-28-2012, 01:19 PM   #8
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My 88 GT was straight piped. It didn't fail on the power front, not so much as the back-pressure advocates would have you believe, and it could deafen you from a mile away with its 4 inch dual exhaust.

In fact, I was petitioned by my neighbors to put the cats back on because it was so loud and I worked such late/early hours that, coming home, anything above an idle would rattle windows and send cats into hissing fits.

God, I loved that little Fox. It was a rat-bagged monster, but it was my first Mustang and I'll always remember it.
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Old 10-28-2012, 01:23 PM   #9
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Originally Posted by Mkolabin
My 88 GT was straight piped. It didn't fail on the power front, not so much as the back-pressure advocates would have you believe, and it could deafen you from a mile away with its 4 inch dual exhaust.

In fact, I was petitioned by my neighbors to put the cats back on because it was so loud and I worked such late/early hours that, coming home, anything above an idle would rattle windows and send cats into hissing fits.

God, I loved that little Fox. It was a rat-bagged monster, but it was my first Mustang and I'll always remember it.
One of the reasons people think you lose low end power is because you gain so much more on the high end!.. It actually feels like you lost on the low end, when in reality you didn't!..
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Old 10-28-2012, 01:25 PM   #10
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Exactly!

And that thread on the myths of back-pressure; awesome!
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Old 10-28-2012, 01:34 PM   #11
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Originally Posted by Mkolabin
Exactly!

And that thread on the myths of back-pressure; awesome!
Thanks!.. They were three different wright ups that I found from different sites!.. I reed through them and figured they could explain it better than I can!.. Lol
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Old 10-28-2012, 01:36 PM   #12
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Thanks!.. They were three different wright ups that I found from different sites!.. I reed through them and figured they could explain it better than I can!.. Lol
Summary: Back-pressure isn't a myth, however; it is not as important as many people believe it is.

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Old 10-28-2012, 01:42 PM   #13
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Such a tired discussion..
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Old 10-28-2012, 01:44 PM   #14
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Originally Posted by Eturner View Post
Lol who started that thread?!?....
Came in handy didn't it?


The trick in exhaust is to balance the flow and velocity. To much of either and it negatively affects performance. The best performing set ups I've seen for boosted engines start out at 2.5" off the headers, expand to 3" through the mufflers and end up at 3.5" out the tailpipes. This system basically forms a "reverse" funnel that allows the hot exhaust gases to flow and expand faster and more efficiently as they are pushed out of the exhaust.
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Old 10-28-2012, 01:48 PM   #15
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Such a tired discussion..
I agree.

Unless, of course, you account for all the people out there who don't know, then it's a great discussion to keep having. And, heck, it equals posts and visits, right? That can't be bad for ME or for me either.

---------- Post added at 11:48 AM ---------- Previous post was at 11:47 AM ----------

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Came in handy didn't it?


The trick in exhaust is to balance the flow and velocity. To much of either and it negatively affects performance. The best performing set ups I've seen for boosted engines start out at 2.5" off the headers, expand to 3" through the mufflers and end up at 3.5" out the tailpipes. This system basically forms a "reverse" funnel that allows the hot exhaust gases to flow and expand faster and more efficiently as they are pushed out of the exhaust.
The "3" is right next to the "4" on the keyboard.

I'm not insane.
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Old 10-28-2012, 01:49 PM   #16
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I have pypes OR H pipe and Pypes Muffler deletes! So i def have the loudest car in my town! Lol! I love not having cats!
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Old 10-28-2012, 01:53 PM   #17
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The "3" is right next to the "4" on the keyboard.

I'm not insane.
Huh?
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Old 10-28-2012, 01:56 PM   #18
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Quote:
Originally Posted by Trojan Horse

Came in handy didn't it?

The trick in exhaust is to balance the flow and velocity. To much of either and it negatively affects performance. The best performing set ups I've seen for boosted engines start out at 2.5" off the headers, expand to 3" through the mufflers and end up at 3.5" out the tailpipes. This system basically forms a "reverse" funnel that allows the hot exhaust gases to flow and expand faster and more efficiently as they are pushed out of the exhaust.
Just slightly!..

You are right about the Flow and Velocity and how to much of either can affect your performance!.. And I also agree with you about the pipe sizes too!..
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Old 10-28-2012, 01:59 PM   #19
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Huh?
Up above there, I typed that my pipes were 4 inches at the tips. I mistyped.

I just didn't want anyone thinking I was crazy, and after I read your post, I noticed my own and was all, "What what what?!"
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Old 10-28-2012, 02:04 PM   #20
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Originally Posted by Jake
I have pypes OR H pipe and Pypes Muffler deletes! So i def have the loudest car in my town! Lol! I love not having cats!
Some buddies of mine at work: "We can tell when your running late!.."
Me: "How's that?!?....."
Buddies: "Because all we hear from a mile down the road is, VVRRROOOOOOOOMMMM!!!!!......"



---------- Post added at 01:04 PM ---------- Previous post was at 01:01 PM ----------

Quote:
Originally Posted by Mkolabin

Up above there, I typed that my pipes were 4 inches at the tips. I mistyped.

I just didn't want anyone thinking I was crazy, and after I read your post, I noticed my own and was all, "What what what?!"
You are like the rest of us!.. You drive a Mustang, and you like to modify it!.. So there for you are Crazy!...



Hi!.. Welcome To The Nut House!...
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Old 10-28-2012, 02:05 PM   #21
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Originally Posted by Eturner
You are like the rest of us!.. You drive a Mustang, and you like to modify it!.. So there for you are Crazy!...



Hi!.. Welcome To The Nut House!...
I feel welcome and warm inside.

Though the warm could be the Scotch.

So could the welcome, now that I think about it.
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Old 10-28-2012, 02:09 PM   #22
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Quote:
Originally Posted by Eturner

Some buddies of mine at work: "We can tell when your running late!.."
Me: "How's that?!?....."
Buddies: "Because all we hear from a mile down the road is, VVRRROOOOOOOOMMMM!!!!!......"



---------- Post added at 01:04 PM ---------- Previous post was at 01:01 PM ----------



You are like the rest of us!.. You drive a Mustang, and you like to modify it!.. So there for you are Crazy!...

Hi!.. Welcome To The Nut House!...
Haha!!! Yea if i floor it there isnt a person in town that dont hear me! Haha!! Im about to upload a video! Ill post it on here!
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Old 10-28-2012, 02:09 PM   #23
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Lol who started that thread?!?....
Doc Turner, specializing in exhaust back pressure
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Old 10-28-2012, 02:15 PM   #24
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The other downside is the smell. On the older cars you are still gonna smell it with the windows rolled up. Sometimes to the point of it getting in your clothes. The newer cars not so much. I cant smell anything with the windows up but in the garage or at a stoplight,windows down, when the wind is blowing the right direction.....yuck. FYI,it sounds like a effing race car.
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Old 10-28-2012, 02:24 PM   #25
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The other downside is the smell. On the older cars you are still gonna smell it with the windows rolled up. Sometimes to the point of it getting in your clothes. The newer cars not so much. I cant smell anything with the windows up but in the garage or at a stoplight,windows down, when the wind is blowing the right direction.....yuck. FYI,it sounds like a effing race car.
Very true, if i have my windows up i dont smell it at all! But if im stopped with my windows down its strong!
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Old 10-28-2012, 02:28 PM   #26
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The other downside is the smell. On the older cars you are still gonna smell it with the windows rolled up. Sometimes to the point of it getting in your clothes. The newer cars not so much. I cant smell anything with the windows up but in the garage or at a stoplight,windows down, when the wind is blowing the right direction.....yuck. FYI,it sounds like a effing race car.
I personally haven't noticed any smells!.. But then again I've been running around with no cats on my cars for a long time!.. A Very Long Time!.. Lol
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Old 10-28-2012, 02:29 PM   #27
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I personally haven't noticed any smells!.. But then again I've been running around with no cats on my cars for a long time!.. A Very Long Time!.. Lol
Cats begin to smell, it's true....

... once you've run them over and left 'em under your car long enough.


HOO WAA!
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Old 10-28-2012, 02:31 PM   #28
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Originally Posted by Mkolabin

Cats begin to smell, it's true....

... once you've run them over and left 'em under your car long enough.

HOO WAA!
Screw running them over!!... I just shoot them!!....
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Old 10-28-2012, 02:32 PM   #29
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I personally haven't noticed any smells!.. But then again I've been running around with no cats on my cars for a long time!.. A Very Long Time!.. Lol

Maybe YOU smell like a catless exhaust and you are just used to it,lol. You probably dont even pay attention to it anymore after running them all the time.

Kinda like smelling your own farts....
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Old 10-28-2012, 02:34 PM   #30
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Maybe YOU smell like a catless exhaust and you are just used to it,lol. You probably dont even pay attention to it anymore after running them all the time.

Kinda like smelling your own farts....
I've been Cat Less sense '98!.... So ya..........
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Old 10-28-2012, 02:35 PM   #31
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Maybe YOU smell like a catless exhaust and you are just used to it,lol. You probably dont even pay attention to it anymore after running them all the time.

Kinda like smelling your own farts....
Ha! Nothing like your own brand
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Old 10-28-2012, 02:36 PM   #32
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I've been Cat Less sense '98!.... So ya..........
And by the way!... My farts smell like High Octane Gas!... Hahahahahaha
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Old 10-28-2012, 02:42 PM   #33
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Pypes Muffler Deletes, Pypes OR H pipe, and it LOUD in person, my phone camera doesnt do it justice=( makes it sound bad!
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Old 10-28-2012, 03:03 PM   #34
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Pypes Muffler Deletes, Pypes OR H pipe, and it LOUD in person, my phone camera doesnt do it justice=( makes it sound bad!
Sounds good!..
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Old 10-28-2012, 03:05 PM   #35
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Sounds good!..
Thanks bud!
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