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Magnaflow CatBack Installed

moregrip

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moregrip Enthusiast

moregrip

Posted
Posted

I've had a magnaflow cat-back system installed on my 2500HD for a couple of weeks now. It replaced the stock system which was a dual 3" inlet, daul 3" outlet HD Muffler, into an external Y, then into an approx. 3.75" diameter, side exit, tail section. (FYI, the HD muffler is for sale if anyone is interested, only has 1,500 miles on it) The stock system was replaced with a Magnaflow daul 3" inlet, internal Y, and a single 4" outlet muffler http://www.magnaflow.com/02product/parts/14594.jpg into a 4" side exiting tail section.

First, let me say, the Magnaflow system removed considerable weight from the truck, which for me, is a good thing The quality of the Magnaflow system is excellent. The muffler and exhaust tip are polished stainless steel (beautiful), with the remainder of the tubing being mandrel bent raw stainless steel, or not polished.

The system was installed by Magnaflow themselves. I can not say enough good things about their facility and employees. The shop was impressive, to say the least, with lots of eye candy to keep you busy and entertained

Brandin (Qwik03) was the guy I mostly dealt with, although I had the pleasure of metting Mario as well .........not. Anyway, after my recent "nightmare stereo install" I am/was extremely nervous and cautious about anyone, other than myself, operating my truck. I'm happy to report, my truck was handled with great care and respect Thanks Brandin, I sure appreciate that!

 

Now for the meat and potatoes. My truck is totally stock, no HP mods what-so-ever, and it made 10-13rwhp gain throughout the entire powerband. Also, each successive dyno pull, netted higher gains, not exactly sure why though.

The 10-13rwhp figure was the most conservative gain after 7 post install dyno pulls.

There is also a noticable SOTP difference, which is an added bonus

 

Noise: wait, that's not it, more like a mechanical symphony

The 22" magnaflow case is a very good compromise between reasonable decibels and great performance!

however, there is some resonance at 1900rpm, although, no where else in the operating rpm range (0-6000rpm). At first I thought this to be a liability, but it's actually quite the opposite. I find myself looking for that magic rpm (1900) just to hear that sound. Since freeway cruising finds me well above that in every situation, except stop-n-go traffic, it is basically a non issue, and is not intrusive at all. It's kinda like a treat, and I know where to find it

 

For anyone considering a Cat-Back System, IMO, give Magnaflow a serious look. I'm certainly enjoying mine, and it makes real HP to boot!

catiaeng Enthusiast

catiaeng

Posted
Posted

:troll: LOVE the Magnaflow! I had mine for about two months now and don't know why I waited so long. Magnaflow has a great sound, and I get compliments on mine all the time, even at the dealership a few weeks ago to have some warranty work on it. About 6 mechanics commented to be about how NICE is sounds.

 

Enjoy the new pipes!

 

BJ

Mort Enthusiast

Mort

Posted
Posted

Very nice install moregrip.That is what I want to do for mine as well but I have been tossing the duals out the rear around as well. Did you consider them at all? Have you heard how they perform and how they sound? Thought you might have asked when you were getting yours installed or while making up your mind.

 

Anyhow, very nice post and thanks for that. :troll:

EastCoast HD Enthusiast

EastCoast HD

Posted
Posted

Looks good. Did they add 2 small lengths of pipe to ends of the inlet pipes where they are clamped to the muffler? Cant really tell from the photos. This is the system I have been considering going with. The resonance has allways been a concern, however by the way you describe it, I could probably live with it. Not to mention the added HP gains. Nice job. Thanks for the info :troll:

dewfpo Senior Enthusiast

dewfpo

Posted
Posted

The reason your rear wheel numbers were changing is becasue the engine computer was still learning the change you made. It may take a week or so of driving for the computer to settle in.

 

DEWFPO

SS Crew Enthusiast

SS Crew

Posted
Posted

How's the interior sound level with that Magnaflow? I had one on my other truck with a 5.3 Its loudest volume was at cruising range (1800 - 2300 rpm), it drove me nuts and had it removed after 2 weeks. I'm real hesitant to go back to Magnaflow again. But you and other people seem to like them. Maybe I'm just too sensitve. My concern is the interior sound level, do you need to turn down the radio to carry on a convesation at highway cruising speeds? Since Corsa doesn't make a system for my truck, I'll have to look elsewhere. Any input is apperciated.

moregrip Enthusiast

moregrip

Posted
  • Author
Posted
Very nice install moregrip.That is what I want to do for mine as well but I have been tossing the duals out the rear around as well. Did you consider them at all? Have you heard how they perform and how they sound? Thought you might have asked when you were getting yours installed or while making up your mind.

 

Anyhow, very nice post and thanks for that. :ughdance:

 

 

 

 

I absolutely considered a dual out the rear setup. What I was told, in most cases, with our trucks, they make slightly less HP, however there have been a few odd balls that made more HP with them.

 

The duals would be a custom job if going magnaflow. IMO, it would only be for looks as the dual 3" inlet to a 4" outlet seems to be very free flowing.

 

FWIW, I'm trusting this system to compliment my Radix SC install very soon, so I personally believe this to be a very well designed system.

moregrip Enthusiast

moregrip

Posted
  • Author
Posted
Looks good. Did they add 2 small lengths of pipe to ends of the inlet pipes where they are clamped to the muffler? Cant really tell from the photos. This is the system I have been considering going with. The resonance has allways been a concern, however by the way you describe it, I could probably live with it. Not to mention the added HP gains. Nice job. Thanks for the info :ughdance:

 

 

 

 

yes, they welded the two small lengths you speak of.

I beleive my 4.10's help to keep me away from the 1900rpm resonance area quite well, so much so, that I have to make an effort to get there to hear it, if you catch my drift.

moregrip Enthusiast

moregrip

Posted
  • Author
Posted
The reason your rear wheel numbers were changing is becasue the engine computer was still learning the change you made.  It may take a week or so of driving for the computer to settle in.

 

DEWFPO

 

 

 

 

I agree. What I didn't mention was my last dyno pull showed a 30rwhp gain. This seems a little unrealistic of course, but non-the-less, it did make the rwhp/rwtq #'s.

moregrip Enthusiast

moregrip

Posted
  • Author
Posted
How's the interior sound level with that Magnaflow?  I had one on my other truck with a 5.3  Its loudest volume was at cruising range (1800 - 2300 rpm), it drove me nuts and had it removed after 2 weeks.  I'm real hesitant to go back to Magnaflow again.  But you and other people seem to like them.  Maybe I'm just too sensitve.  My concern is the interior sound level, do you need to turn down the radio to carry on a convesation at highway cruising speeds?  Since Corsa doesn't make a system for my truck, I'll have to look elsewhere.  Any input is apperciated.

 

 

 

 

The 22" case is really very docile. It gets slightly louder as it warms up.

I would not consider this to be a loud system at all, in fact, it is rather quiet.

Interior volume is very low to mild, I do not have to talk any louder to hold a conversation.

fastdrvr23 Enthusiast

fastdrvr23

Posted
Posted

I know I have a measly 1500, but I have a magnaflow 18" Single 3", Dual 2.5" straight out the back with 3" Stainless magnaflow tips. I couldn't be happier with the sound or performance. Mid range and Top end were very noticeable increases, and with the Wester's PCM I even gained some at the lower RPM range (mainly because of the removal of Torque Management) Gas mileage went up a little too, went I wasn't romping on it to hear the goodness that came with heavy throttle.

 

In my sig there are some sound clips, if anyone wants to hear what that setup sounds like on a 4.8L.

 

Magnaflow = Big :ughdance:

Mort Enthusiast

Mort

Posted
Posted
I absolutely considered a dual out the rear setup. What I was told, in most cases, with our trucks, they make slightly less HP, however there have been a few odd balls that made more HP with them.

 

The duals would be a custom job if going magnaflow. IMO, it would only be for looks as the dual 3" inlet to a 4" outlet seems to be very free flowing.

 

FWIW, I'm trusting this system to compliment my Radix SC install very soon, so I personally believe this to be a very well designed system.

 

 

 

 

Thanks for info, much appreciated. :D

By the way I believe that Magnaflow now makes Dual Rear Exit Catbacks for the '03-'04 1500HD # 15828 and the 2500HD #15829 as well as the regular SSE 1500HD #15782 and the 2500HD #15789. Nice to have a choice when there was none for so long.

 

Keep up with the great posts and good luck with the Radix. I am really looking forward to hearing how it goes for you. :chevy:

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