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Discussion Starter #1 (Edited)
GSX-S 1000 DE-CAT HEADER RACE PIPES
https://www.facebook.com/pg/blackwidowexhausts/photos/?tab=album&album_id=1863169250628070
Comment attached to one of the facebook pics:
"Please note, very small unbaffled end cans that rely on the catalytic converter to reduce the noise will become very loud (re-map may be required for simple metal tube designs as they may offer not back pressure)"

Blackwidow install instructions for anyone interested:
http://s000.tinyupload.com/index.php?file_id=70282723839622562653

 

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You left out the first part of the quote....

Please note, very small unbaffled end cans that rely on the catalytic converter to reduce the noise will become very loud (re-map may be required for simple metal tube designs as they may offer not back pressure)

All headers are metal tubes. Removing the catalytic converter and muffler is what would give you back pressure issues. Technically, anytime you make an exhaust modification, you should re-map. It looks like a solid system! I'd give them a try if they were in the USA.
 

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Under £400.
They also come with a dummy bracket to fasten the servo cables to, which fastens next to the chain guard.
 

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Discussion Starter #4
You left out the first part of the quote....

Please note, very small unbaffled end cans that rely on the catalytic converter to reduce the noise will become very loud (re-map may be required for simple metal tube designs as they may offer not back pressure)
Edited. Ah yes, simple metal tube design refers to the end can not the headers themselves as I initially thought. Interestingly their gsxr headers specifically mentions not requiring remap for standard settings - I guess different bike, different requirements.
 

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Looks like an economy version of my Arrow header.
Why do you "say" that? :confused:

I have the Arrow headers, and I was not that impressed.

The Arrow headers are slip fit + springs in the flangs/sleeves bolted to the top/exhaust ports.
I prefere the OEM and this (Black Widow) headers that are *bolted* tight to the top/exhaust ports.
This will require much less tolerance in design opposed to sleeves/springs that allow some more adjustments,
BUT, the sleeve/spring "fit" might induce some leaks although I have not had problems with my Arrows (nor Akra with similar design).

I see that Black Widow skips the tubes between header pipes which I think is good, due to no risk of leaks in this area either.
The effects on engine output is negligible, if there are any benefits at all with this design, even if the OEM also have these tubes between the header pipes.
But on the OEM they are welded=no risk of leaks.

And I see the Black Widow system have the same diameter on the end of the intermediate tube.
The Arrow have a bigger diameter which not all aftermarket can/link tube fits (Akrapovic end can does).
The thick gasket is supposed to sit between the intermediate tube (from headers) and the link pipe from the can.
I had to expand this link pipe to make my Mivv can+link pipe fit to the Arrow header/pipe.

It would be nice if both Arrow and Black Widow presented dyno-figures before/after their systems.
 

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Any dump with before and after. I’d like to see how it compares to the arrows for removing the midrange dip


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Any dump with before and after. I’d like to see how it compares to the arrows for removing the midrange dip


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exactly the reason I'm looking at exhausts!

In my opinion this bike should easily power wheelie 1st and 2nd gear. My buddy's FZ-09 does and it's 30+hp and 10ftlb torque less than the GSXS!
 

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exactly the reason I'm looking at exhausts!



In my opinion this bike should easily power wheelie 1st and 2nd gear. My buddy's FZ-09 does and it's 30+hp and 10ftlb torque less than the GSXS!


The gearing on our bikes is higher so it’ll wheelie less than bikes like the go-09 and 10.


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Ordered Black Widow Headers...

I just ordered the black widow headers. They should get from Bedfordshire, UK to my door in Mississippi in a week for the low low price of 45 pound sterling (whatever that figures out to in USD), plus 374 pound sterling for the headers/downpipes. I think I'm going to leave the stock end can on the bike with the new headers and see if the sound is satisfactory. I really like the fact that the black widow headers come with a servo motor bypass kit AND new exhaust gaskets. Plus, I can leave the stock heat shield on if I so choose. The M4 slip on allows the heat shield to be kept I believe. I'll report in once the pipes are installed.
 

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If you can help someone I bought the Black widow exhaust manifolds and I'm very happy with it. They cost a lot less than the arrow and make a great noise even with the original final muffler.
 

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Black Widow Headers Installed...

My black widow headers came in from Britain to my door in Mississippi in 5 days (what a small world). I had to remove the front lightning bolt-looking fairings off of my naked model, the radiator, riders seat. You can basically take this bike apart with a set of allen keys and a 10mm socket.
Getting the servo cables and servo out of the bike was the most difficult part. Black widow includes a bracket to replace the existing bracket on the servo motor so that when the bike does its startup sequence it "senses" whatever it needs to sense on the servo to believe that it's in good order, but I accidentally moved the servo a smidge when removing it, and trying to get the servo back into the correct position without the bike giving me a C46 code ("SET valve is broken" code) coupled with the fact that I had to perform surgery for 30 minutes just to get the servo out made break down and order a healtech servo eliminator for this bike, which is the size of a quarter and plugs into the servo's wiring harness to eliminate the check engine light/F1 code.
I have a K&N filter, the stock end can, and Frank's tune from superbikeUK magazine on the power commander. The bike has a nice rumble at idle and a throaty angry shrieking when revved. It's sounds sick under hard acceleration up to redline and it pops and crackles when downshifting (which I think sounds cool).
I assume I'm now running way lean. Do any of y'all have a close-ish tune for my setup? I've looked all over at many different dyno graphs, but there aren't a lot of fuel tables.
 

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My black widow headers came in from Britain to my door in Mississippi in 5 days (what a small world). I had to remove the front lightning bolt-looking fairings off of my naked model, the radiator, riders seat. You can basically take this bike apart with a set of allen keys and a 10mm socket.
Getting the servo cables and servo out of the bike was the most difficult part. Black widow includes a bracket to replace the existing bracket on the servo motor so that when the bike does its startup sequence it "senses" whatever it needs to sense on the servo to believe that it's in good order, but I accidentally moved the servo a smidge when removing it, and trying to get the servo back into the correct position without the bike giving me a C46 code ("SET valve is broken" code) coupled with the fact that I had to perform surgery for 30 minutes just to get the servo out made break down and order a healtech servo eliminator for this bike, which is the size of a quarter and plugs into the servo's wiring harness to eliminate the check engine light/F1 code.
I have a K&N filter, the stock end can, and Frank's tune from superbikeUK magazine on the power commander. The bike has a nice rumble at idle and a throaty angry shrieking when revved. It's sounds sick under hard acceleration up to redline and it pops and crackles when downshifting (which I think sounds cool).
I assume I'm now running way lean. Do any of y'all have a close-ish tune for my setup? I've looked all over at many different dyno graphs, but there aren't a lot of fuel tables.
How loud is it? Like do neighbors come out of their houses shaking their fists at you?
 

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Don't like it too loud. Its like a beacon shouting to the cops "I'm over here, and going pretty fast!" haha

I think I'm gonna keep the stock exhaust for now. I want headers but i want to keep the muffler in the stock location so I can remove the passenger pegs and brackets, but the stock muffler and M4 seem pretty loud. With the brackets gone a Wilburs 641 Blueline shock and a carbon fiber rear hugger would look awesome on my blue naked.
 

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I just installed the healtech servo eliminator, which took about 5 minutes and required 1 allen key and a phillips head. I have a PC5 installed and decided to go ahead and order an autotuner to match. The autotuner sensor screws into an 18mm bung, while the black widow headers came with a 13mm (stock) bung, so i'll have to come up with a solution for where I want to drill/mount the 18mm bung. I'll keep y'all posted...
 
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