Magnaflow Cat-Back reviews...

Big-Foot

Member
Aug 20, 2005
123
2
18
Kenyon, MN
The system I installed today was the Magnaflow Cat-Back system (not MagnaPaks)
Install
The hardest part about the installation was getting the car high enough on jack stands (rear end must hang free) to get the exhaust pipes out.
Getting the stock pipes out from around the differential was a little goofy and it took some twisting and jacking the car up higher. The new pipes went in much easier as they have a different contour but still fit well within the tunnel. The mufflers are very well made and have different inlet angles from the stock mufflers (less acute in angle - closer to straight in).
The whole procedure took a little more than an hour only because I was being so anal about the alignment of the tips with the body cut-outs.

SOUND
The sound is very mellow at an idle and under 3,000 RPM.
No drone that I can find (I was worried about that).
When you get on it - it sounds much louder but not "Call the Cops" loud.

Performance
I've built a lot of race as well as street cars in my 40 years of wrenching.. This car performed pretty well out of the box.
Testing was done on asphalt road (away from a populated area) - clean - 85 degrees, low humidity.
The the TCS turned off and with stock pipes, you could idle the clutch out and nail it from a 5mph roll. The tires would chirp just a little but stay hooked up until you hammer the next gear when they would bark pretty good.
Now - after installing the exhaust, the same held true in terms of the initial chirp-age of the tires until you hit about 3200 RPM. The tires would start to break loose again and actually wail a little complaint up to about 4500 RPM when they would settle back down again. At 5500 RPM I would hammer 2nd gear and the tires actually broke loose for about a 200 RPM rise until they hooked back up again. For the first time - I hit the rev limiter at the top of 2nd gear and hammered 3rd. Chirp! Yes boys and girls - 3rd gear chirp-age.. :banana:

Synopsis
Money well spent. Good sound. Good performance. easy installation. :nice:

Tools required;
15mm deep socket
13mm Socket
13mm combination wrench
6" extension
Ratchet
Beer. :cheers:
 
Can you provide any tips on how to properly align the cat back system? I have the magnapacks and the shop that put mine in did a TERRIBLE job at getting the mufflers anywhere close to being aligned. I'll take pics if that would help...

Just trying to get some general tips on adjusting how far tips come out and then alignment from left to right or whatever...

Thanks,
Will
 
Hi Will,

I actually had to use a tire iron between the tailpipe tip (right next to the muffler) and the rear hanger on the driver's side to shift the hanger over about 1/2" to get the tip centered in the body cut-out. This was done after loosening and twisting the exhaust pipes a little. It took a fair amount of trial and error - about 15 minutes was spent tweeking the whole 9-yards. All in all it came out reasonably well. You might find yourself loosening the whole system to get it twisted into the right position.
 
i have replaced the over the axle pipes and mufflers as well. i found that when adjusting the tips, it helps to have the over the axle pipe loose at the muffler and the h-pipe. if you have a buddy watch (so you dont have to crawl out from under the car a bunch of times) they can tell you when you have a good fit. then tighten up the bolts at the muffler. make sure the tips are still aligned, then tighten up the bolts at the h-pipe. hope this helps.
 
I installed a Magna-flow cat back on my 95 gt vert. tons of problems with install, and professional installer had to hack up system to make it fit. based on that, I am not much of a magnaflow fan. seems weird that you had to take a tire iron to try to get the exhaust to line up, they should have this worked out by now so that the system fits.

I put a MAC cat back in my 96 gt vert and the thing fit like a glove. Continual fitment problems with the magna-flow are discouraging especially when they are $450! I am interested in a new exhaust but your review reminded me of my 95 and all the problems.

Sam
 
Just wondering if you have a auto or manual trans, my car is completely stock (manual) and I have always been able to break the tires loose in second and get a long chirp in third. The only reason I ask is I am assuming that your car is auto and the upgrade did improve performance. I have long debated what my first couple of mods will be and exhaust seems to get mixed reviews, mostly others are reporting no increase in HP. It sounds like you are very happy with your new exhaust, I might reconsider this upgrade since yours went so well, congrats.
 
Hmmm, factory system is a 2.5" Stainless steel Mandrel bent system. After market system's are 2.5" Stainless steel Mandrel bent systems.

The only way to see a performance gain with an exhaust system for the 05's would be the mufflers and I don't think the stock mufflers are all that bad that you would see a gain at all.

I am kind of curious what part number's are on the mufflers of the Magnaflow kits as well as the tips? The reason, I wonder if you bought these individually would they be cheaper than the kit.
 
TGJ said:
Hmmm, factory system is a 2.5" Stainless steel Mandrel bent system. After market system's are 2.5" Stainless steel Mandrel bent systems.

The only way to see a performance gain with an exhaust system for the 05's would be the mufflers and I don't think the stock mufflers are all that bad that you would see a gain at all.


Exactly......I'm gonna have to call bull**** on the performance gains claimed here too. Not even the manufacturer make such outragous claims..........

I have the MagnaPack cat-back system on mine, and if they added 2-3 rwhp I'd be very surprised.
 
sams66 said:
I installed a Magna-flow cat back on my 95 gt vert. tons of problems with install, and professional installer had to hack up system to make it fit. based on that, I am not much of a magnaflow fan. seems weird that you had to take a tire iron to try to get the exhaust to line up, they should have this worked out by now so that the system fits.

I put a MAC cat back in my 96 gt vert and the thing fit like a glove. Continual fitment problems with the magna-flow are discouraging especially when they are $450! I am interested in a new exhaust but your review reminded me of my 95 and all the problems.

Sam

Can't speak to the fit of the earlier models. I hadn't read anything bad about them which was one of the reasons I decided in the direction I did.
Matter of fact, getting the old pipes out was a lot of twisting and re-positioning, twisting again - finally the pipe came out. Fitting the new pipes from Magnaflow went smooth as goose-poop..

In regard to having to tweek the muffler mounting pin on the rear of the left side - it's no big deal - it's just a pin and it moved to exactly where I wanted it.
Point in fact - I may very well have gotten by with loosening the clamps and turning the exhaust pipe a 1/16th of a turn to re-position the muffler. Was not a big deal to me but I felt I needed to mention it.
The install is perfectly symetrical when it comes to the pipes and the body cut-outs.
It's as I said in the review - Money well spent.. :nice:
 
Red Pony said:
Just wondering if you have a auto or manual trans, my car is completely stock (manual) and I have always been able to break the tires loose in second and get a long chirp in third. The only reason I ask is I am assuming that your car is auto and the upgrade did improve performance. I have long debated what my first couple of mods will be and exhaust seems to get mixed reviews, mostly others are reporting no increase in HP. It sounds like you are very happy with your new exhaust, I might reconsider this upgrade since yours went so well, congrats.

Manual 5 speed. The only dyno I ran it on was the Levi's Dyno.. Shifting - I don't power-shift this car (accelerator left on the floor while banging gears) - I lift / shift / hammer the throttle... The Tremec TR3650 is not nearly as stout as it's Cousin the TR3550 while it is a good deal stronger than the anemic T5 (even the World Class variants)..

I am happy with it - and that's what really counts...
 
TGJ said:
Hmmm, factory system is a 2.5" Stainless steel Mandrel bent system. After market system's are 2.5" Stainless steel Mandrel bent systems.

The only way to see a performance gain with an exhaust system for the 05's would be the mufflers and I don't think the stock mufflers are all that bad that you would see a gain at all.

I am kind of curious what part number's are on the mufflers of the Magnaflow kits as well as the tips? The reason, I wonder if you bought these individually would they be cheaper than the kit.

The kit is PN 15881
http://www.magnaflow.com/02product/shopexd.asp?zone=American&id=358

The pipes that come off the car were flattened slightly as they went over the rear axle (factory made them that way) - However - I do not think that this slight flattening would make a lot of difference in terms of flow.

BUT

As I said in the review - the muffler inlet pipes are at a much less acute angle on the new mufflers. Also - if you look inside the muffler (Magnaflow) their is more of a straight shot through (diagonally) the muffler from inlet to outlet. The tube passing from in/out is perforated.. Not wanting to take the muffler to my band saw to totally disect it - I guess that's gotta be good enough..

The tips on the mufflers are Chrome resonator tips and are welded in place.

You can find this kit as cheap as $440 complete. I don't remember where I saw that price, but look around a little and I'm sure you can..
 
SC-NTO said:
Exactly......I'm gonna have to call bull**** on the performance gains claimed here too. Not even the manufacturer make such outragous claims..........

I have the MagnaPack cat-back system on mine, and if they added 2-3 rwhp I'd be very surprised.

Glad you have an opinion... You know mine.
I'm not out to impress or depress you either way. If you're happy with your pipes - I'm tickled pink...

I'm happy with mine.. :spot:
 
You're welcome Will...

BTW - I thought I remembered reading a dyno test of this exhaust system and I was right.

On Magnaflow's website, they have electronic reprints of magazine articles. Here is one on the Magnaflow CatBack system:

http://www.magnaflow.com/05news/magazine/0550mustang01.asp

Where they say:

The Mustang baselined in the high 260-rwhp range, and the MagnaFlow system gained anywhere from 9-12 rwhp on that depending on how you look at the data. That's a soft way of reviewing dyno numbers, we know, but complicating things is that Kevin's GT uses an automatic transmission, which definitely affects the data compared to the manual-transmission cars.
 
Big-Foot! Great freakin review!!! :nice:

I have a V6, and I ordered a Bassani cat-back but had to ship it back today cause it was for a Y-pipe (I have an H-pipe). So i'm ordering a Magnaflow system and I want to know what you guys would recomend.

Regular or Magnapacks? Yes, it would be a GT kit on a V6 so I already know it's not going to be the same sound... but any help?

Here's some links.

http://mustangtuning.com/99gtmawti.html

http://mustangtuning.com/maca99gt.html

And this one... it's the only other one that I might concider

http://mustangtuning.com/slpexhaust.html

What would you guys recomend?
 
By there very nature of having 2 fewer cylinders and power pulses throughout the 4 strokes - 6 cylinders tend to sound a bit raspy. 4 cylinders even moreso.
I think I would want to lean toward a system that was more mellow that would help blend the power pulses.
Hence - I think I would recommend the Magnaflow over the MagnaPacks.

I'm really hoping that others chime in on this thread with their own reviews of the Magnaflow system.