Exhaust Gurus Chime In

[Bucksaw]

So I traded my 14 Ram with the 6.4 for a newer one last week. The 14 had a killer Magnaflow, single side exit setup. The sound was perfect and the performance was awesome. The new truck is a 15 and has been dualed out to a 13" Flowmaster with dual tailpipes dumped over the axel. Im not crazy about this setup because it is all 3" pipe, the welds are shoddy, the bends are kinked and restrictive, and the Flowmaster is too loud and has that pop to it that I don't care for.


Ideally I would like to have the same setup as was on my 14, but since I don't have the factory 3.5" tailpipe to modify for a single exhaust, I am thinking about running a new 22" case Magnaflow (straight through design with an internal x-pipe) and dumping it right before the axel to smooth out the exhaust path and eliminate the kinked tailpipes that are on it now. The factory setup was a 3.5" single exhaust, which if you break it down to volumetric flow, equals the same as 2.5" dual tailpipes.

My question is, would it be worth the money to go with a 2.5" pipe to match the factory flow volume, or just stick with the 3" and not worry about the loss of exhaust velocity? The factory pipe coming off the exhaust manifolds are 2 3/4", but the factory y-pipe that came on these trucks is pretty restrictive. I don't want to open the exhaust up too much and lose some performance, but if the 3" is going to be ok, then I will save the money and time it would take to change it all to 2 1/2"

[COACH_EM_UP]

Yes.

[Bucksaw]

Yes, go with a 2.5", or yes, the 3" will work?

[WItoTX]

Whats creates you the pop you don't like is the bends/poor mandrel bends of the flowmaster, which is really a product of flow restriction. As the exhaust flows across the bends, and muffler baffles, it creates that popping sound. So the straighter the pipe, and better mandrel bends of a better system will reduce the pop sound. In addition, from what I remember, the flowmaster muffler had more baffles inside, which created more popping, or rap. From what I remember, the magnaflow is essentially just an open chamber, or resonator. I last did this 5 years ago, and the design may have changed since then.

If you go to 3", you will get more open flow, but more of the droning sounds, but significantly less pop as its less restrictive.

[Bucksaw]

Whats creates you the pop you don't like is the bends/poor mandrel bends of the flowmaster, which is really a product of flow restriction. As the exhaust flows across the bends, and muffler baffles, it creates that popping sound. So the straighter the pipe, and better mandrel bends of a better system will reduce the pop sound. In addition, from what I remember, the flowmaster muffler had more baffles inside, which created more popping, or rap. From what I remember, the magnaflow is essentially just an open chamber, or resonator. I last did this 5 years ago, and the design may have changed since then.

If you go to 3", you will get more open flow, but more of the droning sounds, but significantly less pop as its less restrictive.

But, you will also lose exhaust velocity which could hamper performance on the low end. I am looking to maximize the exhaust velocity without creating restriction. That's actually what I am trying to figure out, is will the 3" duals be too much flow to the point that it is reducing performance. This truck just doesn't seem as stout as my 14 was, but that could be a number of factors.