Yes, it's the can that supplies the restriction in the exhaust. Without the restriction, the mixture gets really lean due to lots more air and same amount of fuel. The choke (enricher probably rather than air restricter) will help compensate. The short ride down to the dealer probably won't hurt much, but I wouldn't make a habit of running without a can. You don't really know how lean it gets and you could burn a valve or something. And yes, it will be loud as hell because the can also has the sound baffles in it. The can (pipe actually) will need to be welded unless it's a "bolt-on".jeostang said:If I can install it I will do that. I was thinking it had to be welded. The bike will idle with the choke on, but cuts off without it, does it run reallty lean with not exhaust? It was loud as hell.