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Old 02-15-2008, 01:25 AM   #1 (permalink)
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Anyone use Flowmaster muffler?

I was just wondering if anyone has used one or if they aren't a good choice? I once heard that they don't work well with a turbo but I cant imagine why. I also heard that dual exhaust doesn't work with a single turbo but lots of guys are running a dual exhaust setup so that must mean that theory is wrong. Does anyone have any hard data to back the rumors?
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Old 02-15-2008, 01:31 AM   #2 (permalink)
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If you're talking about using Flowmaster like 44 series or something meant for gas trucks, I wouldn't recommend it. You need a straight through muff to eliminate backpressure. Haven't heard about the dual exhaust/single turbo one though.
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Old 02-15-2008, 01:33 AM   #3 (permalink)
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i beleive flowmaster has a different line for diesels like tonemaster or something. duals on a single turbo means nothing i dont know where that would come from. umless it was right after the turbo or something. look at all the big rigs with dual stacks. the only thing is regular flowmasters aren't straight through like most aftermarket diesel mufflers but look at the stocker.
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Old 02-15-2008, 01:44 AM   #4 (permalink)
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Good point. Look at the stock muffler. Talk about restrictive. I also know that the reason Flowmasters work as well as they do is because they actually reduce back pressure by design. Not to many chamber mufflers can claim that. And sure I know a straight through works but if a Flowmaster works on the Cummins application then it must give a pretty different sound.
The theory I heard about running duals is that the exhaust is spinning from the turbo and to disturb that flow creates a resistance. I'm not saying I buy it either but that it is a rumor.
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Old 02-15-2008, 02:46 AM   #5 (permalink)
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A buddy of mine has a 97 12v around 400hp.It has 3 flowmasters on it one right behind the other.I dont no why it is on there i told him to stright pipe it
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Old 02-15-2008, 10:24 AM   #6 (permalink)
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I have a FlowMaster HushPower on my truck. Mine was a test unit I was asked to put on my truck because it was stock. The sound is nice and there was not much difference in the noise levele inside the cab. No drone. It is a flow through design as you can see straight through it and it has what looked like perforated baffels inside it also.

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Old 02-15-2008, 01:41 PM   #7 (permalink)
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I have had a Flowmaster 4'' kit on my rig for a while now. I love the sound, it sounds a little differnent then any other cummins around. I'm not too worried about the baffled design inside the muffler, Flowmaster has been around for many years and I think they now what they are doing.
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