What month is this mag and what is on the cover? I got the new 5.0 and it has Uncle Robins V6 05 car on the cover.

 

In 5.0 Magazine the Magnaflows made 9rwhp-

I am stuck in an airport in Denver right now- so I will have to wait to read the article before I make judgements-

however if they just dynoed one catback, swapped catbacks- then dynoed the next- then swapped- exc I think there could be some major flaws in the test-

WIth the 05 computer- more then ever you have to give the car time to learn the new exhaust system- so they could be confusing the heck out of the computer by coninously switching the mufflers around-

You can find a link to the article from 5.0 magazine at www.magnaflow.com

With out reading the article- my first impression is they just threw on the mufflers without letting the car learn the new exhaust system- to save time- as it would have taken several days to test all of those mufflers correcty-

Not to mention that cars make more power earlier in the morning- because of the density of the air-

The same thing happened when another magazine did an article on our minicooper exhaust- they said we only made 3fwhp and we saw 18fwhp gains- they were also switching all of the exhausts around-

We called them up and gave them the proper test procedures- and they saw a 16fwhp gain-


I am almost willing to bet money they did not give the 05 ample time to learn each exhaust system-

I guess tomorrow Ill have to give our PR person a call and let them know so we can contact the magazine- I will then report the test procedures used by the magazine-

Unfortunately when you have time restrictions, big shoot outs can not always be done correctly- we have seen it happen many many times-

There is no way a straight pipe should make less hp on a completely stock GT- Ford did a good job on the mufflers but not that good-

not saying there should be huge gains- but there should definitely be gains-

Brent

 

http://www.magnaflow.com/05news/maga...0mustang01.asp


Here is the link to the article in 5.0 magazine- which just goes to show how tricky dyno testing the 05 can really be-

 

And it's ten times more tricky trying to run it consistently down a track, where conditions are never the same from one run to the next. Major props to those guys that do it well!!

 

I just cannot believe that this topic was covered by the magazine. Why do people buy a certain type of exhaust? Well usually it is a combination of sound and power, in this case you can pretty much rule out sound to help you shop because the mag won't let you hear them. Sure you can get db's but I don't think anyone but old farts and young kids care about too quiet or too loud with db's, it all comes down to quality of sound. Secondly the power has been proven to be non-existent with axle back system changes. Yes dyno pulls vary back to back even up to 5 or more rear wheel horsepower, I have seen this on my own car. The 05 computer changes things on a modified engine so frequently it is almost impossible to get consistent numbers even on the same day. Bottom line is please don't waste your money thinking you are getting 2-3 more rear wheel horsepower than the other guy becuase you probably are not. Take my advice, only buy what combination you have heard and like, or take a chance buying without hearing like I did. Thank god I like the sound of my car because I have heard some that would have made me box up the mufflers and send em' back.

 

Yeah, I think most people seem to be purchasing for the sound.

Seems to be common knowledge that nothing but sound is to be gained from the axle backs on the 05 GT's.

What did catch my eye tho was a loss for no mufflers.

 

Straight pipes used to be a controversial issue depending on what type of engine you were running as well as the size of piping for exhaust. I believe that the 2.5 inch exhaust flows well for the characteristics of this engine (3V) and it particularly likes just a little back pressure. I competed against a Roush that had long tubes that were open at the collectors, it was loud as heck on the throttle and quiet at idle but actually was slower than with full exhaust.

 

I already posted this question by starting a new thread, and I should have just posted here, The bassani Bx R series mufflers that are shaped like the can style mufflers were tested over the regular style. Does anyone know anything about these mufflers. I cannot seem to find anything about them.

 

man i got the wrong mag........ I got the mm&ff that states LONE STAR LUNATICS with 2 mustangs on it. Is this the one with the X-Pipes in it because I dont see it

 

.2 HP gains unmuffled, lol, that tells you the whole story.

 

Can anyone who has this month's MM&FF scan the article and post? This would be greatly appreciated. I would like to see the 'tables' for all the systems and compare hp/torque at different RPM. Thanks.

 

Update...it seems all tests were done without letting the computers adjust to the new systems....just change and dyno....which is what I thought

 

I scanned the artical but could not post the pictures here as they are too large, so I made a web page for any that want to view them. Enjoy.

http://members.***.net/silverstang05/

 

The article says they used an AFM tuner to monitor/adjust the air/fuel ratio. The biggest problem I've heard with mods is the A/F ratio, the car tends to lean out. I'm sure the magazine was smart enough to watch out for heat soak. I don't think the engine will advance the timing with a muffler mod. The magazine seemed to be aware of these factors and tried to account for them. Except for cam timing, what other factors would affect power output? Please leave the dyno out of possible factors.

 

I finally got the magazine. I noticed a mistake on average HP for the FRPP mufflers. The magazine shows a lower average HP for the FRPP mufflers. That's not possible. The FRPPs where ahead at every rpm point. Compare and go down the line starting at 2400 rpm. Granted, we are still taking about 3-4 HP gains. I didn't check the other mufflers. I'm pretty sure the dyno numbers are good. I think some screwed up the averaging later.

 

Thanks Steve. That's what I was looking for.

 

1TrickPony-
The computer controls alot more then just the A/F ratio- what about timing, fuel curves exc......

An aftermarket exhaust will decrease engine/exhaust temperatures along with NOX which enables the computer to add in timing-

This is because the motor does not need to work as hard to push the exhaust out- as a result of the exhaust not getting backed up, which results in lower combustion chamber temperatures-

The 05 needs time to adjust to this- and if you keep changing the parameters- the computer can and will get confused-

We found this out when doing our R&D work-

In fact I have spoken with several of the Flowmaster reps at the last few shows, and they even mentioned they were having similar problems- in fact they ended up using 6 different GTs to design their axle backs because the car was throwing them for such loops-

An axle back does not effect the A/F ratio on the 05 GT- as an intake would- so the A/F ratio does not do much when testing catbacks

How is it 5.0 Magazine saw a 9rwhp gain with a system, and MM&FF saw a 0rwhp gain with the same system-

Its because they let the computer adjust to the new system-

Something is not right- and that something is you need to let the computer adjust to the new system- period-

I can tell you right now that we tested everyone's system at our R&D center- and all the systems mentioned made more power then what the magazine has them making-

The factory exhaust is good- dont get me wrong- you will not see the same gains as on the 99-04 models- but it is not that good-

You will get 5-10rwhp gains out of aftermarket exhaust depending on brand chosen- its up to you to decide which brand-

and straight pipes will get you much more then .2 hp because it is a proven fact that these mod motors LOVE to breathe-

Brent

 

Brent,

Thank you for replying. No matter what, I respect your company for taking the time to respond. I have not seen another vendor defending their product.

V/R

Greg

 

Thanks Greg!

 

Brent, what about MM&FF claim that the Magnaflows (66 dB) and quieter than stock levels (68 dB) at idle? It was the only system quieter than stock. Has your R&D testing validated this? Is this also because of the 'adjustment' or break-in time needed?

I'm really leaning toward the Magnaflows. I like the quality, design, and price; but don't want it quieter than stock and losing power. Here's your chance for the sales pitch.

Thanks.