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Looking into options on how to decat my bike and torn between new headers or a simple de-cat pipe. the bike is not going to be tuned any more than decat and lose the first muffler, a woolwich ECU flash plus K&N air filter and 16t front sprocket. Keeping the stock tailpipe.

Tempted to go the de-cat link pipe route keeping the Suzuki headers with the exhaust valve but losing the cat and huge box silencer in the hope of changing the exhaust note with an increase in power and reduction in weight. Not too sure on the exhaust valve and its operation, assume it acts as a mute, throttling down at low revs and then opening up at xxxxrpm? Like the idea of this mod as its cheap at £140.

Alternatively I can go to after market headers, Black widow at £399, Alpha at £580, Yoshi £820. My money would go on the Black widow as, to be honest I can't justify spending yoshi money, and the alpha would have to deliver something exceptional for its extra cost. I note that there are link pipes on the stock exhaust and they are on the arrow too, doe they make a difference to the engines performance?

Does anyone have any performance figures or an opinion on these systems. Open to discussion on alternatives too.
 

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The stock exhaust is not that restrictive, and by no means quiet. :)

You will find a few posts about what to expect if you swap the OEM exhaust with headers, airbox-mod/filter.
With OEM or aftermarket pipe.
Plus piggybak-fueling (PCV)or ECU reflash/tune.

It will yield 10-15HP+ gain.

Just a decat alone will not give much I believe apart for better? looks.
(Most do not find the OEM huge muffler very "attractive") :)

At least I cannot recall seeing any dyno figures for just doing this "noise-only" mod.
 

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I too wondered what to do...
I looked into Black Widow and heard very mixed reviews... Apparently the build quality is not all that and the fit was far from perfect...

So after much deliberation... I have a set of Arrow RaceTec headers being fitted at the weekend.... A bit eyewatering at £700 though...
They use the standard fittings and are compatible with the stock can and my Remus Hypercone.

I Will post performance figures!
 

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If you didn’t have to cut the cat out of the stock headers I would say just get a link pipe. But the stock headers are SS and are probably fairly heavy compared to the arrow SS headers. So my vote is arrow header plus whatever can you like.
 

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Well it's done...

I have a nice set of Arrow Race-Tec headers, a power commander v, a K&N air filter, Remus Hypocone slip-on and a nice custom Dyno...

The work was done by HM racing...(fantastic crew)

So I considered Black Widow... But HM racing, an independent specialist who build Racing bikes, and have no connection to any particular manufactures said use Akrapovic or Arrow and steer clear of Black widow...

I can't comment on black widow... But here is the main dyno results....
 

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I've been looking round and settled on a plan of fitting a PCv this month , then fitting black widow headers next month , ( already has r11 can ) then riding it over to cresant suzuki ( supplying dealer) for them to install custom map/dyno set up . The workshop manager / dyno man there said he'd set up other bikes with black widow headers and gave no warnings against them . I can cut out about 400 quid of labour plus the headers are 400 quid cheaper , are they 400 quid worse or will they just brown up a bit over time ? I'm pretty anal about cleaning !
 

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I did the cat delete with the dominator mid pipe. Impressive manufacturing quality, good sound, still tuning the bike with PCV. Cheap, effective, and easy to do.
 

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Dear Friends,

Who needs M4 pipe and headers together(set) 550$ around? I use this 1000km and I want to sale from istanbul, I can ship worldwild
 

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Dear Friends,

Who needs M4 pipe and headers together(set) 550$ around? I use this 1000km and I want to sale from istanbul, I can ship worldwild
I'll have them, but as you are new here and no history you will have to send them to me before I pay for them...:)
 

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another bogus dyno run....not in a bad way towards you...if it dont cross at 5252 its one way to play with results.....Dale walker who is as good as any ,150 runs gets in the 150 range....you guys throw on a few things and Wa La...150 plus hp....your crossing at over 9000 rpm....there was another dyno chart crossing at 4500 from another member...both made 150 plus hp...why no 5252 cross...arr it dont matter as long as the members are happy
 

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another bogus dyno run....not in a bad way towards you...if it dont cross at 5252 its one way to play with results.....Dale walker who is as good as any ,150 runs gets in the 150 range....you guys throw on a few things and Wa La...150 plus hp....your crossing at over 9000 rpm....there was another dyno chart crossing at 4500 from another member...both made 150 plus hp...why no 5252 cross...arr it dont matter as long as the members are happy
Not everyone is american on this forum - only Dyno runs with imperial BHP and lbft that have the same vertical axis cross over at 5252rpm

If you use PS or Nm they crosso over completely different and even if you have BHP and lbft but have 0-160BHP axis and 0-100lbft axis they still won't cross over at 5252rpm.

And when the bike was first launched, the Suzuki engineers said it was actually producing more like 160bhp as stock
 

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So did the engineers lie or do we not actually have 160hp? I’d like to dyno mine soon. There’s a reputable shop but wants 129 for 3 runs. Ripoff imho. I’d pay like 50sh for a couple runs.

About hour away there are more shops w a dyno that I’d like to ride to and see if they would run it.

Sadly don’t have a before dyno but I’m stock w flash, can’t be any difference.
 

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So did the engineers lie or do we not actually have 160hp? I’d like to dyno mine soon. There’s a reputable shop but wants 129 for 3 runs. Ripoff imho. I’d pay like 50sh for a couple runs.

About hour away there are more shops w a dyno that I’d like to ride to and see if they would run it.

Sadly don’t have a before dyno but I’m stock w flash, can’t be any difference.
Thy may have been talking about crank power instead of rwhp....

I would hope you have more power than stock after a flash - its normal to correct the fueling, add some ignition advance etc.
 

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Thy may have been talking about crank power instead of rwhp....

I would hope you have more power than stock after a flash - its normal to correct the fueling, add some ignition advance etc.


But nothing mechanically changed, just an ecu. Its the same exhaust, same air filter, no more air, no more gas being pumped out. I dont see how it can be that much different, I mean it feels great, but I only had 6 miles on my bike when I sent ecu off to flash. Dont really remember the bike at all other than extremely jerky and hard engine break.

If I get a dyne! I will make sure to post it up.
 

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But nothing mechanically changed, just an ecu. Its the same exhaust, same air filter, no more air, no more gas being pumped out. I dont see how it can be that much different, I mean it feels great, but I only had 6 miles on my bike when I sent ecu off to flash. Dont really remember the bike at all other than extremely jerky and hard engine break.

If I get a dyne! I will make sure to post it up.
Most bikes come very conservative from the factory so its easy to unleash more power by getting the fuelling correct, and can run more ignition advance because you run on 1st world fuels - I imagine he opened the STPs more and he may have changed the exhaust valve mapping because that restricts the bike to keep the noise down
 

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std exhaust

The stock exhaust is not that restrictive, and by no means quiet. :)

You will find a few posts about what to expect if you swap the OEM exhaust with headers, airbox-mod/filter.
With OEM or aftermarket pipe.
Plus piggybak-fueling (PCV)or ECU reflash/tune.

It will yield 10-15HP+ gain.

Just a decat alone will not give much I believe apart for better? looks.
(Most do not find the OEM huge muffler very "attractive") :)

At least I cannot recall seeing any dyno figures for just doing this "noise-only" mod.
the stock exhaust is fairly restrictive as the headers are smaller than the ex port by 2mm, the headers have lots of inclusions in the pathway of the gas flow, the collecters are more like wrap around joiners, the ex valve restricts flow , the secondary pipes limit midrange power considerably, the outlet pipe is too small by around 7mm id, so yes the stock exhaust is restrictive, but most modern engines will still make good power no matter what is bolted onto the ex port
 

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I'll have them, but as you are new here and no history you will have to send them to me before I pay for them...:)
hello Robbieben,

nice to meet you, yes you are exactly right, but this site is very colorfull, I did not find meetings area,

you can see in here sale page. also my detail and picture

https://www.sahibinden.com/ilan/yedek-parca-aksesuar-donanim-tuning-motosiklet-ekipmanlari-yedek-parca-suzuki-gsxs1000-ve-f-modelleri-icin-m4-headersli-set-580503783/detay/

Best wishes
HAlil
 

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hello Robbieben,

nice to meet you, yes you are exactly right, but this site is very colorfull, I did not find meetings area,

you can see in here sale page. also my detail and picture

https://www.sahibinden.com/ilan/yedek-parca-aksesuar-donanim-tuning-motosiklet-ekipmanlari-yedek-parca-suzuki-gsxs1000-ve-f-modelleri-icin-m4-headersli-set-580503783/detay/

Best wishes
HAlil
I'll take the system, price delivered to United Kingdom?
How about half up front and half when received? As I said before, you are not known before your sale post.
 
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