Bye Bye Lm Hello Magnaflow
#23
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Originally Posted by 300bhp/ton
LM is 3" and while the Magnaflow is good it's proven to be a restriction on cammed, h/c setups. It will NOT flow as well as the LM. Just take a look at the mufflers, LM = straight thru, Magnalfow = not.
Last edited by SOMSS; 10-17-2006 at 05:48 PM.
#26
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Originally Posted by SOMSS
Wrong, the Magnaflow is a straight thru design. Take one and hold it up to your eye, you can see right through it.
BTW - ,aybe it is straight thru then, do you have a cut-away picture of one at all? But due to the dual exit and non linier flow this will produce I very much doubt it will flow as well as a LM resonator.
EDIT:
Originally Posted by SOMSS
Why did you get 1 7/8" Kooks?
Originally Posted by SOMSS
They are too big for a car without a power adder. You are loosing some bottom end hp and torque.
#27
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I havent seen too many people bash Magnaflow. I have flowmaster and have good reason to bash them. I have the stainless cutout and when I dynoed back to back, the flow is costing me 32rwhp under the cutout open. Anyway, I was wanting to go to Magnaflow or maybe B&B. I love the look and the fact that its stainless. But Magnaflow for the price. I will give the flowmaster volume. Its friggin loud with LT's, ORY and MS4
#28
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I'm not bashing the Magnaflow, just stating that I personally doubt it flows as well as the SLP LM.
EDIT:
Take a look at this thread: https://ls1tech.com/forums/dynamometer-results-comparisons/522896-my-99-z-mustang-dyno.html
It's a dyno run of a pretty stock Fbody, exhaust, lid p&p TB. Yet they still picked up 5rwhp over the Magnaflow catback with the cutout open. So it proves the Maganaflow is a slight restriction even at this level. The restriction will increase with the more HP produced. By how much I really don't know.
It should also be accepted that the cutout may have also affected the exhaust pressure wave.
EDIT:
Take a look at this thread: https://ls1tech.com/forums/dynamometer-results-comparisons/522896-my-99-z-mustang-dyno.html
It's a dyno run of a pretty stock Fbody, exhaust, lid p&p TB. Yet they still picked up 5rwhp over the Magnaflow catback with the cutout open. So it proves the Maganaflow is a slight restriction even at this level. The restriction will increase with the more HP produced. By how much I really don't know.
It should also be accepted that the cutout may have also affected the exhaust pressure wave.
Last edited by 300bhp/ton; 10-18-2006 at 06:45 AM.
#29
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i had LM on my 2000 z and i got magnaflow on my 2002 right now. as of right now, i would probably take the LM since im stock manifolds and since it is louder. but i know im going with headers and ory so thats why i took magnaflow this time. first i just had an slp lid. then i installed the magnaflow, and as far as the sotp feel, it woke up my car. it felt torquier as hell too.. cant wait to do headers. but yeah, the magnaflow is quiet.
#30
Originally Posted by 300bhp/ton
Yeah like I have one sitting on the floor next to me.
BTW - ,aybe it is straight thru then, do you have a cut-away picture of one at all? But due to the dual exit and non linier flow this will produce I very much doubt it will flow as well as a LM resonator.
EDIT:
BTW - ,aybe it is straight thru then, do you have a cut-away picture of one at all? But due to the dual exit and non linier flow this will produce I very much doubt it will flow as well as a LM resonator.
EDIT:
#31
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Originally Posted by 300bhp/ton
I'm not bashing the Magnaflow, just stating that I personally doubt it flows as well as the SLP LM.
EDIT:
Take a look at this thread: https://ls1tech.com/forums/showthread.php?t=522896
It's a dyno run of a pretty stock Fbody, exhaust, lid p&p TB. Yet they still picked up 5rwhp over the Magnaflow catback with the cutout open. So it proves the Maganaflow is a slight restriction even at this level. The restriction will increase with the more HP produced. By how much I really don't know.
It should also be accepted that the cutout may have also affected the exhaust pressure wave.
EDIT:
Take a look at this thread: https://ls1tech.com/forums/showthread.php?t=522896
It's a dyno run of a pretty stock Fbody, exhaust, lid p&p TB. Yet they still picked up 5rwhp over the Magnaflow catback with the cutout open. So it proves the Maganaflow is a slight restriction even at this level. The restriction will increase with the more HP produced. By how much I really don't know.
It should also be accepted that the cutout may have also affected the exhaust pressure wave.
#32
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Originally Posted by Dal1as
That's the catback for a V6.
Here's the LS1 version:
Originally Posted by Dal1as
The one for the LS1 has the passenger side outlet right next to the inlet with no restriction.
Besides how does that make it any more "straight--thru"???? The pic of the LT1 version still has a side outlet next to the inlet, it just happens to be on the opporsit side of the muffler.
Originally Posted by Dal1as
As for the 5 hp issue. Any amount of exhaust is going to be more restrictive than a cutout.
Originally Posted by Dal1as
You'd see a gain over the loudmouth also.
Originally Posted by Dal1as
I'm guessing the Loudmouth and Magnaflow are pretty close.
#33
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I have the lm1 and took out the resanator and put in a mangnaflow bullet and it sounds great compared to the resnator that was on there. Alot deeper nad killed almost all the rasp
#35
Originally Posted by 300bhp/ton
my bad, although according to Magnaflows website this one is for a LT1.
Here's the LS1 version:
Here's the LS1 version:
Originally Posted by 300bhp/ton
So the exhust gases would be required to do a 180 degree turn, doesn't sound straight thru or opitmal to me.
Originally Posted by 300bhp/ton
Besides how does that make it any more "straight--thru"???? The pic of the LT1 version still has a side outlet next to the inlet, it just happens to be on the opporsit side of the muffler.
Originally Posted by 300bhp/ton
Not according to David Vizard, try the sticky (exhaust/induction) there's a link in my sig to it, and read post 13 onwards.
Originally Posted by 300bhp/ton
I honestly don't know, the LM resonator may produce some turbulance and I'm not sure it's affect on the exhaust pressure wave, but these attributes affect the Magnaflow. But the LM is striaght thru, no turns no restriction. I feel confident in saying that the LM resonator actually flows better than the 3" tubing either side of it. So a cutout would yield no gain in flow and thus no HP for that reason. Any gain would more likely be attributed to the affect on the exhaust pressure wave.
Like I said the loudmouth should be less restrictive seeing as it uses just a resonator but the Magnaflow setup has been tested and flows great. Both exhausts would starte eating power on the higher horsepower setups though.
Possibly, but the more HP you have the bigger the descrepancy is likely to become.[/QUOTE]
#37
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Originally Posted by 02SS#406
I might be a dumb-***, but gaining only 5hp with a cut-out, tells me that the Magnaflow is flowing pretty damn well...
25-30rwhp on a mostly stock car with exhaust mods is pretty much it.