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hey!
i got a 2004 honda crf405r my exhaust broke and i looking for a new one. i like how the dual ones look and was wondering, you think a 2014 honda crf450r dual exhaust would fit on my 2004? given i make a mount for he left side to hold.
it should be the same slip on size?
do they bend the same way?

Welcome to the site !!

Anything is possible , but considering the left side numberplate is almost flat compared to the right , you will have issues getting the muffler out far enough to clear the tire when the suspension travels , as it will most likely melt if it is directly pushed into it , you could use a heat gun and bend it , but you will not gain anything adding it , actually you will most likely lose power with it , as the backpressure from both mufflers will be a lot more than the single would ever restrict (which is why most everyone with a dual muffler bike wants to put aftermarket SINGLE side mufflers on them) the extra weight , along with the reduction in power , along with the bulk , yea looks cool , but functionally , its not worth it....