well since you have made it clear you are looking mostly at performance than anything else...let's look at what they claim.

Magnaflow: 10% increase in HP
Dyno of a F-150 Harley Davidson
Some sound clips:
http://www.magnaflow.com/04sound/04trucks.asp
FAQ:
http://www.magnaflow.com/07techtips/faq.asp




Flowmaster: They claim a 5%-10% increase in HP and 1 - 2 MPG increase.
Sound Clips:
http://www.flowmastermufflers.com/cg...ter/sound.html
FAQ:
http://www.flowmastermufflers.com/cg...aster/faq.html

Borla: Claim a 5% - 15% increase in HP
Sound Clips: http://www.borla.com click the "hear it now" button, center of page.
FAQ: http://www.borla.com/faqs/

I think most people on here go with flowmaster, in your situation probably the 50 Series or maybe even 60. They claim that the 50, 60 and 70 will perform as well as the 40's.

I am going with Magnaflow for a few reasons. I talked to a guy here that is a Flowmaster dealer/installer, and he hates them. He tried to talk me into going with glass-packs!!! The over-all design, I just don't like, they put baffles inside to deflect the gasses. Where-as, Magnaflow is just a strait tube with a slight curve in it inside the muffler, with tiny perferated wholes all thru it to absorb all the crap that needs absorbed. Also, I prefer the sound of Magnaflow.

I'm not sure about which Magnaflow muffler would be comparable to the 50 series flowmaster, but im sure they could help you out over the phone. I simply told the muffler man what I wanted and he picked out the muffler he thought would fit. I am paying $60 a piece for mine.

I will find out Tues, what it sounds like and let you know. I am not wanting anything over bearing either, I just want a nice mealow sound, with some extra ponies to boot!!!

Another company I talked to said that the 4.6L Fords typically are quiter than the Chevy and Dodge.

Sorry, this is so long, trying to be helpful!!

 

I appreciate all the help man. Let me know what model you end up getting of the magnaflow.

 

I'm very impressed with that Magnaflow website. I've also decided that all I need is a higher flow muffler from extensive research on our site. Looks like the Magnaflow has me hooked because of price and performance. The aluminum will be my choice because it is lighter and the price is better than the stainless steel yet the same performance. One other bit of information you might find useful which I searched here is that the 18 inch Magnaflow will be significantly louder than the 24 inch. Probably the 18 equals the 40 Flowmaster and the 24 equals the 70 Flowmaster for loudness of sound (lower number being a bit quieter). Good luck in your search and anyone who does a muffler replace please give us a review.

 

Yeah, I have spent most of the night going through and reading all the old post that have anything to do with exhaust systems. It seems to me that for the smaller V8's like the one I have (4.6L), the Magnaflow is better at providing more Low End torque than the Flowmaster. Has has a more mellow sound, and you don't get the exhaust resonating into the cab. Which, if you have ever dealt with that, it is pretty annoying.

I have learned a little more info about the differences in Duals and just replacing the stock muffler with a high flow performance muffler. It seems that unless you have some major performance modifications, that it is best to run a single exhaust pipe.

So I would have to give props to 2004Screw, he was right.

I guess old skool thinking isn't always right.

I think I will save my extra dough, and just have a si/do magnaflow muffler installed with dual tips coming out the side!!!!!

I'll let you all know how that turns out!!!

--
KBL

 

Would it be better just changing the stock muffler to a magnaflow single in/single out muffler and keeping the stock 2.25 pipes or to convert to a single in/dual out muffler.

 

keep your stock pipe and run a AeroTurbine 2525 you will be very happy best exhaust you can buy and will last longer then your New F-150

 

Moved to exhaust forum

 

Pylda,

I would keep the existing stock pipe up to the muffler. Replace stock muffler with either SI/SO or SI/DO,(Depending on wether you want dual tail pipes or not. Performance wise, it doesn't really matter wether you go single or dual after the muffler.) then go with whatever size pipe they recommend for the tail pipes. Oh, and the tips.

I talked to my local Magnaflow Dealer/Installer today, and that was his recommendation.

The bad part is, I already had him order my stuff, and to re-order the SI/DO would take until Friday, and I am simply tired of waiting and just want this done. He assured me, I would have a good performing exhaust system that will last for many years.

Again, mine is costing me $250 bucks that's with duals all the way going into two seperate mufflers, then exiting in front of the RR tire, with tips. He said he was going to go with 2.25" to keep the low end torque up.

If you did yours the way I described, I'm sure it would be even cheaper than mine. If prices are comparable where you are to here, of course.

Hope this helps,
KBL

 

I had the 40 series Flowmaster installed this morning, it has a great sound to it. Its a little louder than i thought it would be, but nonetheless, i still like it. I had chrome tips out the back walk out price of $294.67, after a $15 coupon.

 

Pylda,

I told you I would keep you up-to-date, so here goes....


I got my truck back today from the Muffler Shop. First thing I noticed was the tips. SHWEEEEEEET!!! He brought them out the side (just like the lightnings) and they look great! The tips are cut with an angle and perfectly flush and even with the side of the truck!

I fired it up and WOW!! perfect sound, exactly what I was looking for. From inside the cab (at idle) you can't even hear them. When your rev up the engine they come alive with a nice deep mellow tone!! I went for an interstate test ( i drive a lot of interstate miles and was concerned they would be too loud ), perfect again. At 70MPH they have that deep tone that is not to obnoxious, but definately there. Also, they really come alive when you dump the pedal into the carpet.

I was VERY please, the installer was dead-on accurate with the install. Best $276 I ever spent on my Truck!!!

Magnaflow has me sold from here on out.

I noticed a definite performance boost. Not a lot, but "seat of the pants" meter was showing it!!! About what was expected.

I think the installer was more pleased about it than I was. He waited for me to pull out, just so he could hear it taking off from outside the cab. Guess he was curious!!

Good Luck

 

What set up did you go with?

Muffler?
Tips?
Pipe size?

 

I went the true dual setup, because I didn't want to wait another week for parts to arrive. (SI/DO Muffler)

I got....

2 - Magnaflow SI/SO mufflers. P/N: 12225 http://www.magnaflow.com/02product/m...iv_al_oval.asp
2 - Chrome slant cut tips. (I think these are just generic style tips)
14' - Aluminized Tubing 2.25".

Later I may go with a double wall tip or something that looks a little nicer, but right now it is fine the way it is.

 

Would the 12225 magnaflow fit on my truck? I would just use one, and keep the stock pipes.

 

Pylda,

The 12225 won't work as a replacement to your stock muffler. Your stock muffler is much longer. That would end up putting your tail pipe into your tire, or real close to it.

I would call magnaflow and tell them you want a muffler to replace your stocker, but keep everything else pipes and all. Or better yet, go talk to your local magnaflow dealer. Trust me that is the way to go, unless he is a goober or something.

They should be able to match you up with the correct part.

 

[QUOTE=kbldawg]Pylda,

The 12225 won't work as a replacement to your stock muffler. Your stock muffler is much longer. That would end up putting your tail pipe into your tire, or real close to it.
[QUOTE]

Or just have a little extra pipe welded on to make up the difference. Should not cost that much more.