Flowmaster?

[thuren67]

hey guys checking ito different exhaust options. I have a nice hawk muffler but always love change. talked to dean about one of his xb systems as a option.

I see a lot of guys running a magnaflow 11148 with good results.
Im looking at a flowmaster series 10. similar size to the magnaflow but the body is shorter, stainless construction.
any feedback???
Maybe ill have to be a test subject lol
http://www.amazon.com/Flowmaster-8425152-Super-Muffler-409S/dp/B003BZ7MHA

[GAXB9R]

RTPerformance did something with a Flowmaster if I'm not mistaken. Not sure if there is a thread on it though.

[snrusnak]

Flowmaster's suck. They are a baffled/chambered design, and will provide minimal performance gains over a stock muffler.

Now I do believe that flowmaster makes some straight through mufflers, but I assume you're talking about the normal ones(which I believe the 10 series is). A magnaflow or any other straight through muffler would be a much better choice for performance.

Also, flowmaster's IIRC are mild steel, and will rust out. Magnaflow's are SS and won't rust.

[thuren67]

Are you backing your statements with fact?

It is a a stainless muffler as stated in my post. Thinhs do not have to be straight through to be maximum performance. Some scavenging and venturi effect can deffinatly help performance. It is also designed for a large v8 so a little 900 wont be a problem.

now im not a expert at all so i may be mistaken too. Just looking at input so thanks for the reply

[Cherryskullz]

http://www.buellxb.com/buell_images/3929_20110421101134_L.jpg

http://www.buellxb.com/buell_images/3929_20090717221135_L.jpg

http://www.buellxb.com/buell_images/3929_20090717221229_L.jpg


painted it black
http://www.buellxb.com/buell_images/3929_20120424161232_L.jpg

[GAXB9R]

Yep that's it^^^

[RT Performance]

Snrusnak clearly know little about performance........
yes a straight through or open header would give peak wide open horsepower if properly tuned but does not give drive abilty and torque would suffer.


I took a old 50 series flow master .
No packing baffled muffler gives you a consitent sound and tune over many years of service.

Made a inlet pipe and built a chin fairing.
Most important you need to use that front mount.
the rear straps alone will not hold it well.
I cut the muffler left and right sides, removed about 1.5 " per side to make it fit the stock saddle and straps.

Made a new rear plate and added dual outlet's
Than relized it was to loud and low end suffer so i installed a pair of large washers to choke the outlet size to 1" per side.

muffler has been on for 4 years just needs a paint job every couple.

[thuren67]

I was thinking the 10 series would be a little bit of both extremes, very high flow but not straight through. stainless and no packing.

looks like i will have to make one lol

[GAXB9R]

Thread jack....how's the bike RT/Cherry? Hope all is well.[cool]

[thuren67]

rt thanks for the reply. hows it sound?

[RT Performance]

Sounds great.
I have a video on you tube but not the best quality.
Cherry's xb is nearly all together new head bearing rear wheel bearings and set tires.

You might need to restric the outlet to inlet size 2-2 1/4"

[thuren67]

I think if i make my own rear mount the muffler wont need to be narrowed at all

[snrusnak]

Are you backing your statements with fact?

It is a a stainless muffler as stated in my post. Thinhs do not have to be straight through to be maximum performance. Some scavenging and venturi effect can deffinatly help performance. It is also designed for a large v8 so a little 900 wont be a problem.

now im not a expert at all so i may be mistaken too. Just looking at input so thanks for the reply


Snrusnak clearly know little about performance........
yes a straight through or open header would give peak wide open horsepower if properly tuned but does not give drive abilty and torque would suffer.

You guys can claim I know little about performance, I clearly know a lot more than you realize. If you put that muffler on your bike you will be leaving power(and torque) on the table.

Straight through mufflers will outperform chambered mufflers every time, at every rpm, in both hp and torque.

Everyone thinks "you need some back pressure to help with low end torque". I don't know who started this rumor but it's complete BS. The reason many people experience a loss in low end torque with an exhaust modification is because they lose exhaust gas velocity. If you gut your muffler, the exhaust is not travelling through small 2" pipe anymore, it's travelling through a large say 6" pipe(not exactly a "pipe" but you get the point). The velocity of the gas slows dramatically at this point, which is why you lose scavenging and low end torque. Keep the pipe 2" the entire distance until exit, and you will not lose low end torque because the velocity of the gas stays high.

The smaller the pipe, the higher the velocity and lower the flow, the larger the pipe the lower the velocity and higher the flow. The best performing exhaust will be the one that is straight through and sized appropriately for both flow and velocity.

This stupid "backpressure" myth needs to stop spreading around the internet forums. I've been on forums for probably 5-10 years and have MAYBE come across 3 people that understand this concept. There's about a million people that don't.

I'm not telling you not to use flowmaster, I don't really care honestly, just was trying to help you out. Just letting you know they are not good for performance. It will only be slightly better than stock(and that's if it's sized appropriately, it could end up worse if you use a huge diameter muffler). If I overlooked the SS thing sorry, I just know that most of them are not SS. I know that ALL magnaflows are SS. It's just a better choice, or any other straight through muffler such as dynomax, etc.

So yes I have facts to back up what I'm saying. And I'm also not an "exhaust professional", but I know a lot about it and I know a lot about gas flow and scavenging.

I'm not getting mad at anyone, but it's really annoying when you try to help someone out, and give ACCURATE information, and someone else tells you that you have no idea what your talking about, when they are the one that doesn't understand it.

And I've seen several dyno's on cars and trucks that swap a flowmaster for a magnaflow and pick up hp(and yes torque at low rpm's also...).

[snrusnak]

I have to say, I am curious to how the flowmaster(and magnaflow) sounds on the buell......

[thuren67]

I have some local dynos available to me so maybe I'll have to make my flow master set up and test it against my hawk and see how my numbers compare to the ones dean posted of the keda

[snrusnak]

I'd be interested to see if the chambered out performs the gutted muffler(that's what hawk is, right?).

You ought to compare it to a straight through muffler as well, you'll be surprised at the difference.

[victormonopoly]

I think flowmasters are too tinny sounding.

[thuren67]

There are a few dyno tests of cars with a big block. Open headers vs flow master type mufflers. Same peak power for both, smoother mid and low with mufflers. And quieter but who cares about that lol


I think I'll build a exhaust with a dynomax bullet 2.5 inch also. Basically like half a keda...

[snrusnak]

Open headers only give a few feet of exhaust pipe. This won't promote high velocity and scavenging. Please don't take what I'm saying the wrong way. If you take one exhaust system with a flowmaster, and then the identical exhaust system but replace that flowmaster with a straight through muffler, it will perform better.

Open headers vs an exhaust with pipe and possibly crossover pipes, etc. are apples to oranges.

You have to compare them equally.

[thuren67]

They stuck 1 series 10 on each header clamped on. No pipe pipe or tip or crossover. Just a plane old drag car. Pretty equal. I don't doubt you though. The numbers will tell us everything lol

[d_adams]

So you're going to use this? I'm just assuming since it's the only 2.5" ID stainless one they have available. Just for reference, mine are 2" ID, 3.5" OD and nowhere near that long.

http://www.dynomax.com/mufflers.php?muffler=racebullet


4-in Round total length, 16.5 shell length, 12 inlet/outlet, 2 1/2
http://www.dynomax.com/images/mufflers/muf_raceb.gif

And you're comparing it to this?

http://i643.photobucket.com/albums/uu151/dadams1969/exhaust%20stuff/xb/RT-XB1/IMAG1122.jpg

Just a single 4" round would be more like a jardine, not one of mine, thx.

[thuren67]

Sorry if I affended you dean. Not my intention.
I will say it will be like a dynomax bullet. Do not compare it to a keda.
Just another guy in his garage with time to kill and a syncrowave tig to play with.
Cheers

[snrusnak]

What is the diameter of the pipe/muffler you'll be using? You'll want to use ~2" for best performance if it's going to be a single. If you do dual mufflers you'd want to go a little smaller, maybe 1.5" or 1.75" just as a rough guess.

I'm going to be modifying my muffler in about 1-2 months and it will basically be a 2" pipe through the gutted muffler. Going to use a perforated pipe to help quiet it. I plan to dyno tune mine, but not until after I ceramic coat my header and put a larger TB on. So needless to say I won't be doing before/after dyno comparisons.

[d_adams]

No offense taken, just clarifying what you're doing.

[jcoledawg]

So , I'm new to the forum and wanna say hello all first off secondly I'm wondering the flowmaster is it the same size as the magnaflow , from what I read the magnaflow almost fits right into the bracket with just a little grinding .

[d_adams]

This. (flowmaster)
http://www.buellxb.com/buell_images/3929_20110421101134_L.jpg

vs this. (magnaflow 11148)

http://i643.photobucket.com/albums/uu151/dadams1969/exhaust%20stuff/xb/magnaflow/IMG_3253.jpg

Ground clearance, especially over a speed bump. That flowmaster is probably a 5" oval can, so it's losing 1.5" in clearance for sure. The magnaflow is only 3.5" thick and 7" wide.

Want one? I've got one powdercoated satin black, it's ready to ship right now, $450.

http://i643.photobucket.com/albums/uu151/dadams1969/exhaust%20stuff/xb/magnaflow/IMAG1219.jpg

[thuren67]

How much shipped

[thuren67]

The cans range from 4 to 4.5 inches. They are thicker then a magnaflow for sure

[d_adams]

In the US, $450 shipped. I can send it out Monday.

[Cherryskullz]

Just want to point out that the picture of me with the flowmaster on the bike... my bike is lowered, so thats not really a good picture to go by for ground clearance.

[d_adams]

Can you measure it from top to bottom? I'm curious as to what it is now.

[thuren67]

Dean a super 10 series is 6.5 long by 9.5 wide by 4 thick
Due to the width I planned to run a custom rear mount so it may be able to mount a hair higher.

[thuren67]

http://www.summitracing.com/parts/DTC-776-14252/
This one is 4.5 thick but appears that it may fit the mount very well and is 1 inch shorter overall then the 11148