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Hi, I am thinking of de-catting my stock 1090 r exhaust.

Two reasons, to firstly let it breathe more and lift the noise up a bit.

Has anyone done this or am I looking at a world of pain. I am handy with a mig welder and have worked with stainless in the past. I am going to grind/cut open the box like area around where the cat is, assume the honeycomb cat is held in place my some internal tack welds, pop these off then close it back up.

leave the exup valve in along withthe O2 sensor.

comments....
 

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I'm guessing it depends on whether there is a government requirement to maintain a cat on the bike. Since it's a fully welded system you either buy the whole exhaust or do some cut and weld work anyways.

I'd think the exhaust ends extend into the cat box (never seen one open to know) so it might work better to connect the pipes separately (or with an x type pipe) inside the box than to leave it open for better flow. You'd have to weld a bung to one (or the x) for the O2 sensor. Then close it.

Probably easier and cleaner looking to create a custom mid-pipe and cut out the cat completely. Personally I'm holding out for the whole system.
 

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I cut up the stock pipe on my 910R, the pipes only go ~10mm inside the can

you can have them for $10 + shipping

the $10 is to pay for the blades I used up:jsm:

easier to buy a mid pipe than make one.....and I've made lots of pipes
 
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