No muffs?
#4
01-12-2006 | 04:13 PM
Thread Starter
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1320 Number of the beast
Joined: Sep 2004
Posts: 1,158
From: Hope IN
Originally Posted by GREG@94GT
yeh.. ya need some back pressure on a stock engine...
the only time ya run straight pipes is w/ a HIGH performance engine...
the only time ya run straight pipes is w/ a HIGH performance engine...
#6
01-12-2006 | 05:26 PM
Junior Member
Joined: Jan 2006
Posts: 5
I ran straight pipes on my 99 gt with cats. Every one said it sounded great but it was really loud in the car i couldent stand it any more and I lost power and it killed my gas mileage. I took it off after about 2 months and got a flowmaster cat back.
#9
01-12-2006 | 07:02 PM
whos gonna ban me next?
Joined: Apr 2005
Posts: 1,268
From: baltimore, MD
backpressure is a myth. you dont need it. the more free flowing an exhaust the more power. it will sound OK at WOT but it will sound like **** otherwise. i ran stock manifolds with an OR Xpipe only at one point
#10
01-12-2006 | 07:48 PM
Mustang Bitches
Joined: Dec 2005
Posts: 292
From: Alpena,Mich
i think it sounds good.so do a lot of people..
my car with no muffs...
http://videos.streetfire.net/Player....6-3963618B1EA4
my car with no muffs...
http://videos.streetfire.net/Player....6-3963618B1EA4
#11
01-12-2006 | 07:54 PM
Guest
Posts: n/a
Originally Posted by dom
backpressure is a myth. you dont need it. the more free flowing an exhaust the more power. it will sound OK at WOT but it will sound like **** otherwise. i ran stock manifolds with an OR Xpipe only at one point
you need some backpressure on a stock engine... the only time that straight pipes are the right road is with a modified engine... on a stock 4.6... straight pipes will counter prductive
#12
01-12-2006 | 11:00 PM
I8URVTEC
Joined: Dec 2005
Posts: 193
From: Virginia Beach, VA
Originally Posted by dom
backpressure is a myth. you dont need it. the more free flowing an exhaust the more power. it will sound OK at WOT but it will sound like **** otherwise. i ran stock manifolds with an OR Xpipe only at one point
backpressure = torque
my automotive instructor builds dragster cars, thats the one thing the whole crew knew and always said.
You need backpressure. Dyno results also prove it.
#13
01-13-2006 | 09:13 AM
whos gonna ban me next?
Joined: Apr 2005
Posts: 1,268
From: baltimore, MD
show me some dyno results.
youre wrong , sorry
scavenging exhaust gasses from a motor at a higher velocity will make more power than scavenging gasses at a lower velocity. tuning a header collector for diameter, length etc is to allow it to propel these gasses from the motor faster. some people confuse this for reasons of "backpressure" when in fact a 5 inch tube may not always flow air faster than a 2 inch tube. just as intake manifold runners are designed to flow air as fast as possible into the motor, the headers are designed to flow air away as fast as possible. never would you want to clog up your motor with air that was already used and not useable. you people are idiots. thanks.
youre wrong , sorry
scavenging exhaust gasses from a motor at a higher velocity will make more power than scavenging gasses at a lower velocity. tuning a header collector for diameter, length etc is to allow it to propel these gasses from the motor faster. some people confuse this for reasons of "backpressure" when in fact a 5 inch tube may not always flow air faster than a 2 inch tube. just as intake manifold runners are designed to flow air as fast as possible into the motor, the headers are designed to flow air away as fast as possible. never would you want to clog up your motor with air that was already used and not useable. you people are idiots. thanks.
#14
01-13-2006 | 09:16 AM
whos gonna ban me next?
Joined: Apr 2005
Posts: 1,268
From: baltimore, MD
if your losing power or torque by removing mufflers, its not because you lost BACKPRESSURE. your motor will always make pressure its called combustion. the reason you MAY lose power or torque is because your stock or barely modified engine isnt making enough exhaust gas to flow at peak speed through your exhaust system. the exhaust gas now tumbles and collides in the piping. if you were to remove your mufflers and decrease your exhaust pipe diameter you would see higher power numbers.
#15
01-13-2006 | 09:53 AM
Administrator
Joined: Sep 2004
Posts: 11,974
From: Orlando,Florida
Originally Posted by dom
if your losing power or torque by removing mufflers, its not because you lost BACKPRESSURE. your motor will always make pressure its called combustion. the reason you MAY lose power or torque is because your stock or barely modified engine isnt making enough exhaust gas to flow at peak speed through your exhaust system. the exhaust gas now tumbles and collides in the piping. if you were to remove your mufflers and decrease your exhaust pipe diameter you would see higher power numbers.
#16
01-13-2006 | 12:46 PM
Member
Joined: Jan 2006
Posts: 47
Originally Posted by dom
show me some dyno results.
youre wrong , sorry
scavenging exhaust gasses from a motor at a higher velocity will make more power than scavenging gasses at a lower velocity. tuning a header collector for diameter, length etc is to allow it to propel these gasses from the motor faster. some people confuse this for reasons of "backpressure" when in fact a 5 inch tube may not always flow air faster than a 2 inch tube. just as intake manifold runners are designed to flow air as fast as possible into the motor, the headers are designed to flow air away as fast as possible. never would you want to clog up your motor with air that was already used and not useable. you people are idiots. thanks.
youre wrong , sorry
scavenging exhaust gasses from a motor at a higher velocity will make more power than scavenging gasses at a lower velocity. tuning a header collector for diameter, length etc is to allow it to propel these gasses from the motor faster. some people confuse this for reasons of "backpressure" when in fact a 5 inch tube may not always flow air faster than a 2 inch tube. just as intake manifold runners are designed to flow air as fast as possible into the motor, the headers are designed to flow air away as fast as possible. never would you want to clog up your motor with air that was already used and not useable. you people are idiots. thanks.
#18
01-13-2006 | 02:44 PM
Guest
Posts: n/a
No mufflers on my ride. Personally, i dont think it is annoying loud. Actually, when she is at idle she purrs like a tiger. <grin> When you go WOT and hit the higher RPM's it is loud as all hell.
So i got a Xpipe and no muffs, but i do have cats. I diddnt notice any drop in power or drop in fuel economy, i diddnt notice any increase in anything either except for the volume of the exhaust, which is fine with me. My setup ran me 250.00 welded in place and fabricated by a custom exhaust shop.
So i got a Xpipe and no muffs, but i do have cats. I diddnt notice any drop in power or drop in fuel economy, i diddnt notice any increase in anything either except for the volume of the exhaust, which is fine with me. My setup ran me 250.00 welded in place and fabricated by a custom exhaust shop.
#19
01-13-2006 | 02:47 PM
whos gonna ban me next?
Joined: Apr 2005
Posts: 1,268
From: baltimore, MD
so did you have a complete catback made without mufflers? or did you just weld in straight pipes? if your going to spend 400 bucks on slp exhaust your better off just doing as jack the ripper did and saving some bucks and some weight. also you wont have big redneck tips. 
#20
01-13-2006 | 02:58 PM
Guest
Posts: n/a
Originally Posted by dom
so did you have a complete catback made without mufflers? or did you just weld in straight pipes? if your going to spend 400 bucks on slp exhaust your better off just doing as jack the ripper did and saving some bucks and some weight. also you wont have big redneck tips.
Honestly, i wasnt concerned about gaining power, i just wanted that V8 to be nice'n'loud.
I dont think i gained any performance, but i certainly diddnt lose any either. It took these guys about 45 min to do the whole install job, they did a bitchin welding job too.
#22
01-13-2006 | 03:02 PM
Guest
Posts: n/a
Originally Posted by dom
with exhaust mods usually you woulnt be able to feel a difference. sometimes the sound can trick you into feeling one way over another. now headers are a different story
I oughta look into headers someday.... still need to get my gears done first though
#23
01-13-2006 | 06:44 PM
I8URVTEC
Joined: Dec 2005
Posts: 193
From: Virginia Beach, VA
It would be different if we were talking about dragster's, but were not. Mufflers will not make backpressure, so if you remove them, there wont be a difference.
If I were to dyno a car with and without cats, youd noticed the dyno run with cats will pump out a whole killing 2-3 extra pounds of torque, while decreasing hp by 2-3. Aand vice versa, with no cats.
Obviously nothing the *** dyno will pickup. Nor do I really care, Im just simply stating that backpressure will make a few extra pounds of torque, while sacrificing a little horsepower.
Its not like I dont know wtf im talking about, im a technician for a stealership, i meant, dealership.
If I were to dyno a car with and without cats, youd noticed the dyno run with cats will pump out a whole killing 2-3 extra pounds of torque, while decreasing hp by 2-3. Aand vice versa, with no cats.
Obviously nothing the *** dyno will pickup. Nor do I really care, Im just simply stating that backpressure will make a few extra pounds of torque, while sacrificing a little horsepower.
Its not like I dont know wtf im talking about, im a technician for a stealership, i meant, dealership.
#25
01-13-2006 | 07:09 PM
Guest
Posts: n/a
Originally Posted by stevemainian
wow.
your a ****.
I hope you die in a high speed accident.
Have a good day.
your a ****.
I hope you die in a high speed accident.
Have a good day.
Damn! Tell ya what, Dom definatly has the ability to be an *******, but that definatly wasnt called for. "I hope you die in a high speed accident"???? Christ. What kind of a piece of **** are you?
Hey Dom, yer an *******, but yer my type of *******.
This guy is just a worthless *****.
#26
01-13-2006 | 09:20 PM
Guest
Posts: n/a
Originally Posted by Jack The Ripper
:ban:
Damn! Tell ya what, Dom definatly has the ability to be an *******, but that definatly wasnt called for. "I hope you die in a high speed accident"???? Christ. What kind of a piece of **** are you?
Hey Dom, yer an *******, but yer my type of *******.
This guy is just a worthless *****.
Damn! Tell ya what, Dom definatly has the ability to be an *******, but that definatly wasnt called for. "I hope you die in a high speed accident"???? Christ. What kind of a piece of **** are you?
Hey Dom, yer an *******, but yer my type of *******.
This guy is just a worthless *****.
#28
01-14-2006 | 01:30 AM
Mustang Superman
Joined: May 2005
Posts: 3,907
From: Your mom's bed
Originally Posted by dom
i never hoped for your death. but if you cant take an insult. yoour a *****. sell your car andd get a chevy
He's 17 years old what do you expect he's no better than Springs..........automotive service technician...he probably changes oil and balances tires...or even better washes cars...oooooo...I could care less what he does for a living or what he knows all I know is newbes DONT NEED TO BE SAYING D*** THINGS
#30
01-15-2006 | 05:15 PM
Thread Starter
|
1320 Number of the beast
Joined: Sep 2004
Posts: 1,158
From: Hope IN
Originally Posted by StormsGT
Hay, anyone out there running str8 pipes on your 4.6? I've been told that the 4.6 sounds great that way.