You are right about the difference of warranty , Black Widow is only two years whereas Delkevic warranty is 5 years .

That said, i did not understand what link you made between the question to know which is better between Delkevic and Black Widow and the " strained relationships " between UK/ French but it must be due to my lack of understanding some things in English .
By the way ´ personnaly , i have no strained relationships with UK ,( although i know you were not speaking about me but about the countries ) i love UK especialy as i grew up with UK / US music which influenced all my life , i just think it is a pitty that there is now some "real borders " between our countries and some taxes to pay when buying some things in UK when living in EU and vice versa .
For me UK is and has always been one of the biggest / most important European countries , so i am sad UK has quit EU ( although i don't want to start a political discussion and also i am not happy with everything about EU ! ).

Do you mean Delkevic and Black Widow are Closer in quality to Yoshimura than they are to Akrapovic ( unless i did not understand something, what is possible ! Lol ) ?
Cause Yoshimura exhausts are as expensive as Akrapovic as far as i know and they are the same type ot quality i believe .
I would choose one or the other eyes closed and might even have a little preference for yoshimura , at least for their sound as i did not have that good experience with Akrapovic unfortunately recently on my bikes ( especialy on my CBR 900 RR but i still hope to resolve that problem if possible ).

 

Sorry just my humour a Brit giving advice to a Frenchman when our countries are having difficulties, I also have no issues and have some very good French friends.

In order of quality I would say Akra then Yoshi (I have one of their cans on my F4i) then Delkevic and then Black widow.

Hope you work out how to get what you are looking for

 

Hail hail Rock N' Roll ! Lol

i had noticed one the 2 small silent blocks under the tank had fallen but i did not know if it happened when the mechanic in my Kawasaki workshop dif the maintenance on the bike or if it was like that when i bought it .
So i bought some new ones to replace these two and the bigger rubber thing at the end of the tank near the seat .
I had wondered if it could be the reason why i had that weird engine sound if it was making somethings vibrating and as it was the only anormal thing i had noticed but i had hard time thinking such a small bit of rubber could be the reason of my problems and when i asked about it to my chief of workshop , he did not seem to react more than that to what i was suggesting as a possible reason for this engine sound changes , so i wait until they could be replaced and kept thinking about my weird and loud engine / exhaust problem for the past month or two month ( hoping i woukd understand what was going on and that i would be able to resolve that problem )...

Finaly , today i could find the time to go to my Kawasaki workshop ( as i am also looking at the 2017/2018 ZX10R which was the one of my Kawasaki chief of workshop , who sold it about a year ago or so , to one of his customers, who now sells it to buy the last ZX10R 2021 version ) and brought them those rubber parts for they get installed .

You won't believe me but once i rode the bike to go back home , it was a really different bike and that disturbing engine sound was gone !
Obviously indid not have the previous exhaust sound back as it had been replaced by the Akrapovic , which i believe , might have an influence on the engine sound due to the way the header/ collector , manages the exhaust pressure / counter pressure of the gases , so the engine sound might not be exactly 100% as it was before with the orevious exhaust but at least i don't hear anymore the weird engine sound that really disturbed me !

I think the fact the vibrations of the engine were going through the tank reaching other parts of the bike , might have made something vibrate and create some sort of feedback maybe or something that made the engine generate that sound and the whole thing had the consequence i was describing about the engine sound !
Now when i whack the throttle , i feel the beast roaring , i hear a better exhaust sound although as it is a quite long muffler ( longer than the Akrapovic hexagonal muffler i installed on my GSX-R 750 k8;, even if it looks the same ) , even without the db killer, the sound is not that loud ( even if i don't look for an overly loud exhaust sound but just what's needed for my ears and for the cars in front of me hear me and pay attention ) and stay quite polite compared to some others but the overall sound of the engine + exhaust now doesn't seems weird anymore as it did to my ears since they had serviced the bike and installed the Akrapovic full eshaust system as well and it doesn't spoil my pleasure anymore !

I was so happy that i shout on the bike on the wayu back home and whacked the throttle like crazy, as if i had the back of the Blade in fire ! Lol
I can't ride a bike if i don't like its sound , it really spoils my pleasure and takes it away , so i was totaly focusing on that problem1; and could not ride the bike all these weeks since inbegan to hear that engine sound , until now that it seems to be back to normal, just because a little bit of rubber had gone away from under the tank .
Now i know that it was when they serviced the bike that they let that damn rubber fall, knowing it is taped to the inside under tha tank and as it was the original one whixh must have been installed 27 years ago , it fell when they removed the tank and they did not see it.

It is not the best exhaust sound i could dream about but the bike now sounds much better , what gives me the desire to ride it and i will study more peacefuly the way to make it sound even better !
One medhanic there , suggested maybe i could have the muffler shortened by a professional / exhaust specialists, to have a louder/ wilder sound, so i might contact the one i had bought my Devil Trophy muffler from, a few years ago and see what he suggests ( he has been doing some competition on circuits for decades and hés a nice guy ).

 

That's great, I'm glad to hear that you discovered the source of the unusual noise and were able to get it resolved. Congratulations.

 

Brilliant, that must be such a relief. The bike of your dreams sounding (mostly) as you would like it to

 

Thanks guys, yes , that really made my day !:
ddI was really disapointed during the past weeks because of that and some other problems to deal with that had nothng to do with that , so i was really hoping to,resolve that problem but the more the time was passing , the more i was wondering if i would be able to understand what was going on and if î would have to ´ spend another amount of money on an exhaust and have to search for it by trial'an error , risking to waste time and monay until i find satisfaction !
But i think the worst was to do not understand why such a sudden change had happened whereas i could not believe the ingeneers at Akrapovic , could have spent some time on it for such a bad result ( at least from my point of view ); so it is a real relief !
And also to be happy once again to be able to ride that bike i had wanted for years , without that frustration !

Also, i was begining to wonder if inwas crazy or what and if inhad an obssession with something that did not exist but i was not ; the engine has found back a much more usual sound when accelerating !

 

Hello, everyone,

Maybe someone knows more about oldscool/old style sport exhaust mufflers. I have one on my cbr900rr. It's carbon look or maybe true carbon fiber surface and have small 'Bos' logo embossed on the surface. Looks like old original muffler or maybe I'm wrong? Maybe someone knows or has seen one of these before?? Thanks

 

BOS are an aftermarket exhaust manufacturer, quite expensive as well.
That end can would not have been an original fit.
They appear to do mainly high end sports bikes now.
https://www.bos-exhausts.company/

 

Thanks! Yes I know about Bos company ant their products, but the question was more about my Bos muffler model

 

I had not seen that post .
There is no mid pipe on the Akrapovic Full exhaust Racing system made for 92 to 99 CBR900 RR , the header / collector / tail pipe is in one part and then the muffler is attached to it with some springs .

As i must have wrote it in another topic here , i resolved my problem of weird Engine sound , which was coming from a silent block under the tank which had fallen from there , making all the vibrations feedback on the frame and other parts as well .
since i put back the silent block under the tank, all went back to normal !

Does anybody of you know the weight of the stock full exhaust system on a 94 CBR900 RR ?