Gsxr exhaust fitment

[Rochy111]

Hi again everyone, would anyone know by any chance if a full exhaust system from a 89 1100 fit  on a 91 1100? The numbers on the silencers are one digit different mine are 41c0 and the 89 are 40c0, also are the headers the same? Thanks in advance much appreciated as always

[Oilyspanner]

Fitting is no problem as dimension wise they're the same. As I remember the headers and collectors are the same, the 1100 m/n (41c model)  had altered silencers internally, maybe to work with the big 40mm cv carbs. When I first got my 1100n it had one 40c silencer and one 41c, the performance was fairly smooth but it can't have made more than 110hp - at the time there were rumours that 40c silencers didn't work well with the 41c bike, this may be inaccurate - but certainly my bike wasn't very impressive with a mix of cans - also I don't know how the 40c (k/l) performs with 41c cans, or a mix of. One thing I do know is that when I fitted an after market system it felt 50% more powerful and a lot lighter - I liked the look of the twin cans to start with, but I prefer what the bike offers with a decent system. The uk bikes had restrictive silencers and when new made 116 to 118 rwhp - with unrestricted market silencers the k and l made 6 to 10hp more and the m/n more than that - performance bikes put some usa silencers on an 1100n in 1992 and it made a little over 130 hp and 83 ft/lb of torque - this was a good example, they vary.

[Rochy111]

Thank you so much for the info, very informative, I have the chance to buy a really good original full system from an 89 as I am putting mine back to original, I still have my original silencers so maybe i can just use the headers as the ones that are on are horrible. Thanks again

[Gixer1460]

Good grief - could be the only one worldwide that will be stock ! 

[Dezza]

Why aren't you binning the stock system, saving weight, and obtaining a relatively cheap power increase by fitting a well designed 4 into 1 or 4 into 2 into 1?

[Captain Chaos]

first thing I noticed when I replaced my stock Slingy 1100 exhaust for a Termignoni 4-2-1, was how stiff the suspension had suddenly become. Weight saving is enormous.

[Rochy111]

It’s more for show not go, I’m returning it to completely original more of a restoration if you like.