Love my magnaflow. No rust either then again I dont take it out in the rain/salt/snow.

 

i make over 720rwhp with a magnaflow, untuned baseline, and plan on making over 800 quite easily

 

Wrong, the Magnaflow is a straight thru design. Take one and hold it up to your eye, you can see right through it. Why did you get 1 7/8" Kooks? They are too big for a car without a power adder. You are loosing some bottom end hp and torque.

 

Could you help me find that?

 

It was there. Hang on.

 

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:

I'm gonna assume this wasn't aimed at me, as I don't have those headers.

Although I do disagree with this.

 

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

 

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.

 

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.

 

That's the catback for a V6. The one for the LS1 has the passenger side outlet right next to the inlet with no restriction. That's why the passenger side tip is louder than the drivers side tip. As for the 5 hp issue. Any amount of exhaust is going to be more restrictive than a cutout. You'd see a gain over the loudmouth also. I'm guessing the Loudmouth and Magnaflow are pretty close.

 

I agree. The more power you have, the more power difference there will be betwen cutout open and through the exhaust.

 

my bad, although according to Magnaflows website this one is for a LT1.

Here's the LS1 version:


So the exhust gases would be required to do a 180 degree turn, doesn't sound straight thru or opitmal to me.

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.

Not according to David Vizard, try the sticky (exhaust/induction) there's a link in my sig to it, and read post 13 onwards.

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.

Possibly, but the more HP you have the bigger the descrepancy is likely to become.

 

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

 

That would be the "magnamouth".

 

I believe The LS1 version and LT1 version are the same and the pictures are messed up. There was a post a few months a go about that and I think and LT1 guy confirmed it. It was about the exhaust being much quieter on the LT1 Magnaflow and not the LS1 Magnaflow or something to that effect. Doesn't pertain to this subject though.

Not optimal but not as bad as it sounds. If you look inside the Magnaflow muffler you'll see the inlet goes straight through the drivers side and the muffler itself is pretty empty with a lot of space. Turbulence may be an issue but being this far downstream where the exhaust has already split the flow I doubt it's much of a restriction. Definately not optimal but not really restrictive.

Look at the picture again. The LT1 or V6 version or whichever it is has the inlet on the passenger side and both outlets on the drivers side with the passenger side tip taking a full wraparound. Exhaust is about scavanging and flow. A longer path is more restrictive.


True, it depends on how powerfull the car is. When they start getting up to the higher horsepower numbers is when even the better flowing exhaust setups start being restrictive.

I still say a cutout would yield better results than the loudmouth on high horsepower setups. I know we've done back to back dynos with Magnaflow and cutout and showed about a 5 hp difference. It was a 400 horsepower car. I'm guessing the loudmouth on the same car would yield a bit better results but still eat a couple horsepower.

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]

 

I might be a dumb-***, but gaining only 5hp with a cut-out, tells me that the Magnaflow is flowing pretty damn well...

 

There is only so much hp to gain with exhaust anyway. Especially with how well most of the headers scavenge.

25-30rwhp on a mostly stock car with exhaust mods is pretty much it.

 

The second one he posted is the right picture for the V8, I just got it last week and thats exactly what came in the box