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03:21:44 - 12/24/2024
V8 Dakotas
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Pittdawg
Dodge Dakota
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4/17/2003
19:28:21
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 Subject: Exhaust and flow question
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I belive Notchx replaced the stock muffler with a flow master and saw no real gain nor loss (obviously I'm speaking of before his s/c). After examining the stock muffler it appears that no gain was had because the stock muffler is quite adequate (it's a pretty damn large muffler for a stock "compact" truck) My question is if I simply replaced my muffler with a single inlet and dual outlet (probably 2.5 in and dual 2.5 out) as opposed to just another aftermarket 2.5 single in single out would this flow much more? The reason I ask is that it appears that unless you have some serious mods a full 3-inch catback only produces top-end horsepower at the expense of low end torque. This I do not want, I never hit the track but I do like to gun it from stoplight to stoplight every now and again. The only catback I have heard of that produces gains w/out a loss in low end is the MBRP dual exhaust system, however I do not see the point in paying for an entire system when a simple muffler swap should achieve the same result (I say this b/c the MBRP piping from the muffler to the cat is 2.5 just like stock). The MBRP then utilizes 2.25 piping after the dual exit, I believe this is why it has no loss of low end. Now, I'm just trying to decide if I will get even better gains with simply swapping the muffler and utiliziing 2.5 dual pipes, would I really be overkilling it by not sticking with 2.25 dual pipes like the MBRP or do you guys think 2.5 dual tail pipes and keeping all the other pipes stock would be the best match?
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SR77
Dodge Dakota
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4/18/2003
08:56:36
|  RE: Exhaust and flow question
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Good question, I would like to know also. I want to put a 50 series Flowmaster on that is single in and dual out and then have the tailpipes exit before the rear tires on each side. I like the old Dodge muscle car look. I talked to a muffler shop by me that said they can do it, but i just want to know which size piping to go with on the dual outlet side of the muffler so i don't lose torque going with the dual tailpipe setup. I was thinking of maybe going with 2.25 and then having 3" tips welded on for looks.
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Pittdawg
Dodge Dakota
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4/18/2003
14:40:04
| RE: Exhaust and flow question
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okay...I did a little more research and I dug up this post
"I have the magnaflows, great muffler a little more pricey than flowmasters but I like the contruction better, less chance of seams breaking. SOunds more mellow than the Flows, but louder than Gibsons. I'm running single/dual 2.5 in with 3.5 in magnaflow slash tips. Umm as far as perf goes, I felt a little decrease in the low-end but that is unavoidable with an exhaust change either single 3" or dual 2.5" Just chip it later and the low end will come back with even more vengence"
I think he is saying that he has 2.5 in and 2.5 out w/ 3.5 tips, and that he lost low end.
So again, could a simple muffler swap, keeping the stock pipes, but utilizing a dual outlet muffler and going with 2.5 pipes flow that much more then stock as to cause a low end power loss?
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bump
Dodge Dakota
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4/19/2003
17:05:38
| RE: Exhaust and flow question
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bump
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Vince
Dodge Dakota
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4/20/2003
02:30:05
| RE: Exhaust and flow question
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I have the MBRP dual exit. I am very happy with it. The problem with these Dakotas (not really a problem) is that they are very efficient stock. They have a large throttle body, a cat that is considered "high flow" by most standards, and a huge muffler that isn't very restrictive. Performance is lost when the speed of the exhaust leaving the engine slows down. By putting large pipes, you are actually slowing the exhaust. I seriously wouldn't go any larger than dual 2.25" unless you had more intake and engine work done. The MBRP is a flow-through design, (just like the Magnaflow, I believe). It isn't chambered, so it is about the least restrictive muffler you can get.
By the way, I personally don't like the look of larger tips. I think it looks like the owner is overcompensating for something, or wished he had a larger diameter exhaust. Oh well, it's still worth it.
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nitraking
Dodge Dakota
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4/20/2003
18:50:56
| RE: Exhaust and flow question
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What Vince said. I got my MBRP ss dual catback installed yesterday. I already had a intake, tried just cutting a couple of mufflers(dynomax super turbo, flowmaster 50 delta) into stock pipes. I just wasn't getting the sound I wanted. Maybe just a MBRP muffler with stock pipes? I went for the full catback. It is awesome!! Like Vince, I don't know if I am real crazy about these huge ass tips, would have preferred a smaller, cleaner tip. But, hey, my spare is still in place and compliments are flowing freely in my direction.
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Pittdawg
Dodge Dakota
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4/20/2003
19:15:34
| RE: Exhaust and flow question
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Okay...so it is pretty clear I should stick with 2 1/4 rather then 2 1/2, however, I'm not really going for sound just for looks and performance, so my question is, was the addition of the MBRP a noticeable power gain, throughout the power band?
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nitraking
Dodge Dakota
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4/20/2003
22:55:03
| RE: Exhaust and flow question
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Well, there are guys here who know way more about mods and performance gains than I do. From my research, it's tough to get any measurable gains with the 4.7, with bolt on exhaust mods.I have read posts here that say cut or gut the 3rd cat. Obviously, there are headers available as well. My gains were not on the butt dyno, more like the brain dyno! LOL I have had a intake for a year, been fumbling with performance mufflers. Now with my MBRP, honestly, no gains, but no loss for performance. For me, that worked, great sound and no loss on the bottom end.
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