This is the funnest thing I heard all day.......just think what it would be w/out........never mind......this is like beating a live horse with a rusted Flowmaster causing it to get a Tetanus Shot .

 

I have a 2006 5.4l 3v. The piping is 2.5" so i decided to stick with that since I am not going to supercharge the truck.
Anyways, I used a Flowmaster 40 series that I had on my old 2000 gt mustang that I had laying around. It has a good sound and I am very pleased with it. The muffler is a 2.5" in and 2.5" out. All I needed to buy was a stainless tip to make it look nice. IMO this is the best route to go. It has a deep sound but not quite as loud since I didnt use 3" piping.

 

What you fail to recognize is that changing to magnaflow, I would increase flow, decrease backpressure further, and loose power along with quality sound for crap sound. Running the size pipe I have (3") I am already scolded by my tuner and suppliers for not allowing the necassary back pressure to optimize the blower.

 

The school I'm from taught me forced induction vehicles, turbo or supercharger, needs a free flowing exhaust. Flowmaster mufflers are more restrictive, magnaflow mufflers aren't, but everyone goes to different schools, and I dislike tit for tat arguments.

I do think my magnaflow sounds better than a flowmaster, just an opinion.

 

If the Flowmaster mufflers are more restrictive then why do you always tell us we lose low end torque from losing backpressure?

 

I don't tell you that. I quote a recent article (which I stopped quoting after the umptamillionth time) that said you may loose 3% torque while gaining 2.5%HP based on the figured provided by the source. I don't agree that all applications loose torque. I find it quite frankly, to be a shallow ended attempt at other manufacturers to misnomer flowmasters name in the order of sales. Who was first to reinvent the exhaust revolution? Flowmaster. Who used to be a cheap off the shelf muffler at your local parts store? Magnaflow. It does get tit for tat very quickly, but I can tell you that through experience I have never had a negative from my flowmasters, and the one time I did use magnaflow, it was beyond negative. To each his own though

 

Navi buddy I'm on the Flowmaster side... I was quoting Stealth in his post...

 

I loved the sound of my flowmaster 40 series on my Dakota 4.7l. I had SIDO and it sounded great. With my new truck I will probably go Magnaflow unless I really don't like the sound. I don't want to lose any torque what so ever. I also doubt that anyone else will either. When you drive a truck that weighs around 6000 lbs, you shouldn't want to lose any torque either. It seems weird to me that some people can't feel a loss of 10 lb feet of torque but somehow claim to feel a HP/TQ increase from a different air filter like a K&N. To each his own.

 

Ill put my .02 in on this. I had both flows and maggie on my 02 never really did see a difference in them except for the rust. Here Jerzy they use a butt load of road salt, my flows lasted 2 years till the muffler rotted off. The flows did sound better than the maggie, as for the performance loss or gain ? didnt really look most of my drivin is highway. I eventually put a flow 40 on due to the maggie being tame on the sound. Now to do my 06 still in the air as to what im gonna put on!!!