Anatomy of a Hayabusa exhaust system

[Camel]

I know it seems sacriligious, but I cannabalised two Yoshimura end cans for this project!

Anyway, must go and pick up some donuts for the rest of this thread.

[CaptainRob]

Camel, you have inspired me to do a similar threat for the gen1 cans... but with the final objective to keep both cans (twin system) cut cut down by 20cm or so. Hopefully keeping all the original stamping clearly visable to fool the blueys. will also be polishing the machine lines out of them

Thats what I did with the stainless steel yoshi rs 3, and bought the carbon fibre tube of ebay.

[Batfink]

Trying to keep the original can skins to see if I can fool the cops.. after looking at Camels thread I am expecting something a bit similar inside the gen 1 cans now

Was thinking they end up looking like this but polished...

   

[Camel]

Hey Captain Rod,

They're the same as the ones I cannabalised! They look good shortened. As do the Gen I cans. Can't say I'm a fan of shortened Gen II cans though. The Gen IIs arse looks big enough from the rear as it is, shortened cans make them look fat from the side too!

[CaptainRob]

Hey Captain Rod,

They're the same as the ones I cannabalised! They look good shortened. As do the Gen I cans. Can't say I'm a fan of shortened Gen II cans though. The Gen IIs arse looks big enough from the rear as it is, shortened cans make them look fat from the side too!

Yep, it was a bit of fun too!
Sounds better as well.
The only reason I made them half size was because it was cheaper to buy one replacement carbon fibre tube and cut it in half. I think they could look better being a bit longer, but I could only find the tube in Pre-cut lengths. It's a great fix for any damaged cans! Keep going with your thread, it's great info!

[Fester]

Hi

There is also a possibility to use the outlets from a Gsrx1000 model 2007-2008

[Skidmarx]

Iv cut down 2x stainless yoshi cans and a stainless muzzy in the past, purely to shorten them

Its a great project, even though stock cans are ugly as fark no matter how short they are :P

Hmm, my current system is pretty modified, bike originally had muzzy 4-1 headers snd a big bastard of a stainless muzzy can, after the accident i fitted a yoshi to the same headers wich just slipped strait on, then had to modify the headers pretty heavily to use the with a brocks alienhead,
Sounds great and pretty much looks how it should

[TempOzzy]

Loving this thread Camel. I've got a second set of cans that I want to modify, but haven't decided on what to salvage yet. I want to keep the stock appearance but go for maximum flow. I've seen Festers work, and it's sort of what I had in mind.

I currently have made the cans 'straight through' by using a 50mm holesaw on an extended arbor to drill through the partition plate inside the inlet. The outlet pipe is still quite narrow though, and I need to butcher the cans to remove it.

My thought is to remove all internals and fit a 50mm tube from entry to exit. No perforations. No silencing material. Will be fairly loud but look entirely stock (even plan to re-weld screws on end caps). Only a Busa owner might notice the absence of small pipes in the muffler outlets.

The idea of using just one muffler for exhausting and using the other for laughing gas gives me a funny feeling in my pants. I love it!

[Ward P]

The standard pipes look crap. Interesting exercise though.

[Camel]

My thought is to remove all internals and fit a 50mm tube from entry to exit. No perforations. No silencing material. Will be fairly loud but look entirely stock (even plan to re-weld screws on end caps). Only a Busa owner might notice the absence of small pipes in the muffler outlets.

If what I think you're saying is correct, then you will have no muffler?

I think someone might notice there's something adrift with your exhaust!

---

I need to get logging again, so last night I welded the catalytic converter housing back together again, smoothed the welds and painted the carapace. No cats inside this time. Rode into work this morning (its a great run from the hills) the lack of cats has made no appreciable difference to the sound levels but my Wide band sensor is behaving consistently now. Still got the standard mufflers on it but pick up my stainless steel 50mm donuts this afternoon so I can hook up the modified muffler and convert to a 4-2-1. Shall post up progress images.

[Zrex1200]

Loving this thread Camel. I've got a second set of cans that I want to modify, but haven't decided on what to salvage yet. I want to keep the stock appearance but go for maximum flow. I've seen Festers work, and it's sort of what I had in mind.

I currently have made the cans 'straight through' by using a 50mm holesaw on an extended arbor to drill through the partition plate inside the inlet. The outlet pipe is still quite narrow though, and I need to butcher the cans to remove it.

My thought is to remove all internals and fit a 50mm tube from entry to exit. No perforations. No silencing material. Will be fairly loud but look entirely stock (even plan to re-weld screws on end caps). Only a Busa owner might notice the absence of small pipes in the muffler outlets.

The idea of using just one muffler for exhausting and using the other for laughing gas gives me a funny feeling in my pants. I love it!

TempOzzy, that is going to be horrendously loud & probably only useable on a dragstrip.

I am running a 11" long 21/4" baffle with 2" outlet in the Kerker Megaphone on my ZRX & it is f'in loud when on the gas. Pass a car @ full noise & look back to see them swerving all over the road, I try to avoid this...usually.


OEM Kerker baffle & my new custom job


Difference in diameter



Much shorter than OEM Kerker



Spun up the new end cap myself from billet aluminium


Above mods gave me 0.4 sec 1/4 mile improvement over a full length Carbon straight thru can, well worth the effort. Obviously had to richen all jetting to match also.

Since these original photo's I have heavily drilled the perf pipe to quieten it further. I had a complex as I was living directly across the road from a , & cracking this into life @ 6 am was getting nerve racking for me.


Your bike & your choice but I think you will end up not really wanting to ride it on the road due to the noise level.

Whats life without a few social experiments .

[Skidmarx]

iv been riding for years with overly loud pipes, and sometimes none, never been looked at twice, currently running the alienhead and dont see much below 5grand, i like noise

[Batfink]

Whats life without a few social experiments .

Socialism

[CaptainRob]

I just bought a Boz Bros Moira system, second hand, but never used - doesnt look like there's much stuck inside there to get in the way of noise or gases! Thinking I will fit it and then modify it to easily change from my twin system to the single slash pipe (no cats)?

[Fester]

Hi

The advantage of the dampers that I have designed is that they sound normal at low speed.
A bit duller but still doable.
Just the sound changes as if one goes to high speed.
It is not about more noise but better drainage of the exhaust gases.

Next month is the turn to deal. The heater to
Entirely of titanium and counteract welded.

For a company that special design for size exhausts brands cars
The reason is that this company wants to make what I want, and the price difference of my exhaust must not let it.

http://www.mbpower.be/