Ok so I’m going to change out my exhaust and have a question.
I’m going to go with the Flowmaster 50 Series Delta Flow Muffler it’s my understanding that cab noise is much lower than the 40 Series but it still sounds cool
http://www.jegs.com/p/Flowmaster/1030938/10002/-1
So I understand that using this muffler that has one input and 2 outputs that I won’t have a true dual exhaust but do you think there would be much of a sound difference between this set up over one if I went with a true dual exhaust using two 50 series mufflers?
The added cost would be around $200 more for true dual exhaust.

 

Complete dual set-up "might" give give ya a marginal WFO performance increase. Either way mufflers only roar when the engine is loaded. MDS cruising won't be much louder than stock. Too much cab resonance with 40's.

 

Good question, I thought of doing the same thing myself, but cost was a factor so I just swaped out the muffler. I would think that you would have much better high RPM performance. I also think that since you will have two mufflers, the exhaust sound should be less that just one. I am basing my opinion on the fact that the bigger the muffler (i.e. the more material and chamber volume) the better it muffles the sound. The smaller the muffler, the less material and chamber, the louder the sound. So the question is two better than one? I vote yes, but remember that our engines are basically a big air pump. The hemi is controlled by a computer program and if you drastically change/reduce the backpressure, you could loose low RPM throttle response/torque but gain high RPM power (3K and up). The factory exhaust is tuned to work with the factory algorithms and vice versa. You might have to buy an aftermarket power programmer to fix the throttle response problem. Don't know if there are even any available yet for the 09 Ram. Damn, throw in some headers and you are looking at a solid 30 to 40 hp gain over stock. Now go find some Fords and Chevys and see if they want to play!! Hey bountyhunter you have a cutoff on your turck, do you feel a big difference in throttle reponse when you open it up?

 

Shoot thats not good!

Have any of you guys with after market mufflers ran into this issue??

 

Are you looking for more sound or more performance? Because the way the engines are computer controlled a muffler will not really get you any real performance gains. If you want some seat of the pants performance your best bet would be a custom tune, that will eliminate or decrease the torque control management. That would probably be good for 20 - 30 horsepower plus give you more immediate response. In most cases with the custom tune you can pick up a couple of miles per gallon on the highway.

You just need to find someone who has hacked the computer program for the new Dodge trucks and knows what they are doing.

 

There are diiferent schools of thougt on how to make power with exhaust modifications.
Some put a lot of emphasis on velocity. If dual exhaust is designed correctly and installed with an x pipe, you should be able to maintain velocity. I am of the school that the whole backpressure argument is hogwash. The only thing backpressure does is limit the motors capability to breathe and, therefore, burn more fuel efficiently. That said, the statement about needing a tune with any meaningful reduction of backpressure is completely true. Not because backpressure does anything for a motor, but because when the ecm goes into open loop the stored injector pulsewidth values will have you running way to lean.

 

where in the heck would we get an x-pipe for the truck? It's not a mustang where x pipes are a dime a dozen. what will fit?

 

I experienced a change in throttle response on two EFI OBDII controlled vehicles that I modified the exhaust from a single to a dual exhaust. I installed flowmasters on both vehicles that had 5.7 liter engines (my favorite displacement) and the throttle response felt like it developed a bogged down feel down low (from idle to 2K RPM) and then jump back. On one car, the bog went away after I installed a cold air induction kit. Trucks with a single muffler will probably not have any throttle response problems. It might be an issue if you go with two mufflers. Sometimes you can compensate by installing a smaller diameter exhaust pipe after the muffler. But again, you probably do not have the time or money to experiment/tune your exhausts. I can get pretty expensive to change your pipes and the factory exhaust is a very well made stainless steel setup. You will probably be very happy with just swapping out your muffler for the 50 series. It changes the personality of the truck big time! In my opinion, it makes your truck much more fun to drive if you don't mind the increased noise. You go from mild mannered to muscle truck! Viva the Hemi!!

 

You are correct about the 50 series, still have the rumble but not as extreme as the 40 series and your interior resonance is significantly lower. The si/do set up is fine, there's nothing to gain with the true duals setup, unless you do some extreme modifications to the engine, change out the headers, and change or delete the cats... I have the si/do and its perfect, i didnt notice a loss in any power or a gain, maybe at higher rpms but i dont wail on the truck much, i did it for sound. I tried the true duals at the shop with some scraps i had and the sound wasnt really to my liking

i used 2.5in piping to 3.5 inch tips, probably why i didnt lose any low end power

 

Muffler shop, Summit, Jegs, Pep boys, etc. X-pipes aren't really vehicle specific. It's just a pipe shaped like an x (not trying to be a smartass). You get one of the correct size (diam.), pipe from the headers into one side, and pipe out of the other side into the mufflers.

Actually, except for the resonators, the stock exhaust on these trucks is not "that" bad. Obviously it errs toward the conservative side as far as sound goes, but for a stock exhaust on a p/u they could have done a whole lot worse. Ever seen the stock exhaust on a 2nd gen?