Slip On compability
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Will they fit? - Almost certainly. Will they flow properly? - Almost certainly.
The biggest issue I see is HOMOLOGATION. The 790 was issued as a EU4 engine - the 890 as EU5 (I believe). The rules are different. Not massively, but they are.
I have a mate who runs a M/C repair business. Mainly Italian bikes. He was telling me that most of the large Italian exhaust marques are having to look very carefully how they are going to offer what customers want (db killer removal) without getting themselves into deep trouble.
The biggest issue I see is HOMOLOGATION. The 790 was issued as a EU4 engine - the 890 as EU5 (I believe). The rules are different. Not massively, but they are.
I have a mate who runs a M/C repair business. Mainly Italian bikes. He was telling me that most of the large Italian exhaust marques are having to look very carefully how they are going to offer what customers want (db killer removal) without getting themselves into deep trouble.
That's what I've noticed, no more db-killer removal. The EU-rules are getting tiresome. Are there any exhausts/slipon for the 790 with a removable db-killer?
The wings have removable DB-killer
I saw your video, really cool! How's the sound with the dB-killer out? Hard to hear from the short clip with the music in the background. Big difference from the original exhaust?
Thanks! It's a bit louder but not so loud that my neighbors hate me. Wings states that it's about 3 dB louder than stock. With the wings it's also a deeper sound than stock.
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I got Wings pipe on my 790 and really happy with it, like Nordic said its louder than stock without dbkiller. Not too loud but a nice upgrade over stock pipe, with dbkiller in stock sounds slightly better I think. Overall Im really happy with it, it looks a lot better than stock banana too 
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Mine (purchased direct from Wings a couple months back) only came with the single, installed db killer.
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Looking at Wings site - the extra bit seems to be on EU models.
So it looks like Wings is the only one with a removable DB-killer? I can't decide between Austin Racing GP1, SC Project S1 or Wings.
Austin Racing says that "Please Also note the 790 systems no longer come supplied with a removable Db killer as they feature an advanced internal instead."
And SC Project says that S1 doesn’t come with DB-killer. Is there none at all or is it non-removable? Claims that its racing only.
Austin Racing says that "Please Also note the 790 systems no longer come supplied with a removable Db killer as they feature an advanced internal instead."
And SC Project says that S1 doesn’t come with DB-killer. Is there none at all or is it non-removable? Claims that its racing only.
Not in the EU
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IIRC it was @EvansB2 who showed the how to. Drilling out all the cap rivets would absolutely count as NOT being easily removable.
Is it this one? YouTube
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I just put on the Spark It twin pipes....they are listed for the 790 Duke and fit my 890 fine...
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It shows however where they predominantly get sold Europe.
The option for those of you NOT bound by Euro-numbers etc is to look for full blown RACE cans. And tbh it would NOT be even marginally hard to adapt many universal slip-ons - I've seen the link pipes on Amazon and ebay. BUT - you won't get Dyno numbers.
Next thing you can expect to see disappear from Eu road pipes - SPRINGS.
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