Which is louder between the two and which one performes the best in power? They both seem to be priced about the same for my 04 screw.

I know that the roush is stainless (correct me if im wrong) and the flowmaster isn't. I live in the "salt belt" here in the MI winters so I guess that plays alittle bit of a factor since I plan on keeping the truck awhile.

 

The flowmaster 40 series 2 chamber is the loudest, and I believe there are two versions. One stainless, one not. I have always had the flowmaster on all my trucks and I feel my truck is louder than any others I have run across. I would go flowmaster.

 

What about the new flowmaster 44 that is supposed to be louder than the 40 correct?

 

If Flowmaster claims it is louder than I would bet it is. I had no idea they came out with a new 44 series.

 

I've read some reviews that people's flowmasters gave them 1 to 2 mpgs but I've also read that the flowmasters loose some tq and I've read that the roush gains tq. Correct me if I'm wrong.

 

The super 44 is the loudest Flowmaster has and as for the loss of torque? I have been asking all of the flowmaster bashers for a dyno sheet and yet to have one.

I love my Super 40. Great performance and the sound is perfect. Any louder and my neighbors would shoot me.

 

The Roush off road is the best exhaust I've seen or heard. I love mine. Get plenty of compliments.

 

anybody know what borla muffler the roush system uses, is it one of their race mufflers?

 

I don't know, I do know it's pretty small, 10" long oval with one 3" in and two 2 1/4" out.

A pic of my roush off road muffler.

 

the Flowmaster 10 series is the loudest. its a single chamber.

 

I beg to differ. The ROR is the loudest, it has 0 chambers.

 

The Roush sounds GREAT!

 

true. i was saying it was the louder of the flowmaster. the ROR is def. the loudest out of all of them though

 

Flowmaster vs Roush? There is no argument, ROUSH. The Roush Off-Road is just as loud as the 2 chamber Flowmaster systems I have ever heard, even at idle, and Flowmasters have loud idles. For a straight through muffler, The Roush Off-Road muffler sure is a loud one. Borla and Roush did a good job on this cat-back. And, the all T-304 stainless is nice to have over 16 gauge aluminized.

Flowmaster
http://www.youtube.com/watch?v=Tf-4iSMpiIg

Roush
http://www.youtube.com/watch?v=Q3Eh5FAH7BU

Incorrect, 10 series Race Series is the loudest Flowmaster, but the Super 44 is the best flowing Flowmaster, and deepest sounding with a straight pipe aggression sound under throttle.

I do not have a dyno to contribute the debate of torque loss, but I did true dual Super 44s on my old 2500HD Silverado, I towed the same boat twice, first time was with stock exhaust, it pulled great and all that, second round was many months later after exhaust, it was just as great as before, but my RPMs were a couple hundred higher, which tells me it struggled more on low end and partial mid end, did get a little less mpg on that trip.