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Assuming this is a Tenere with the stock exhaust, the cat is somewhere inside the big box under the seat. If you've got the Yamaha Akra cans, they're in the 'bulge' in each link pipe just in front of the silencer.
The reason there are two pipes coming out of the engine is something complicated to do with exhaust tuning (increased gas velocity over a single large pipe?) which someone else can probably explain better than me.
The reason there are two pipes/outlets coming out of the big silencer box on the stock system is to make the bike look symmetric, nothing more.
If you buy an aftermarket 2-1 system, you will remove the big box under the seat, and therefore the cat.
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I spent a lot of money on travel and racing motorcycles - the rest I just squandered.
XT660Z -
Commuter, Adventurer...Racer?
www.dashmoto.net
Other bikes >> MT-03 / CG125BR-J / ER-6F
Departed >> ZXR400L3 / EC300 / DR-Z400E / DR800S / GPZ500S / GS400
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