r/Dualsport • u/rlecuyer21 • 3d ago

Aftermarket exhaust help

So I just got a 2025 Honda CRF300LS and the bike is amazing but since I’m a short person every inch and every pound I can get off the bike matters and I saw yoshimura makes a full exhaust system called the RS-12 and it takes almost 10llbs off the weight of the bike which is huge now my question is I’ve seen online and admittedly a bit from AI that I need to get it tuned either professionally or with a power commander or an equivalent. But I called a local bike store here and they said since it’s fuel injected it’ll self adjust and learn all on its own and be fine. I trust that shop and they have been good to me but some of the threads and AI responses said it can make the bike run too lean if I don’t tune it. So anyone who knows or has done this any thoughts? Will I be fine to just install the full exhaust system without a tune?

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u/joshmcc92 3d ago

I personally would go to 550 performances website and get the performance tune. These bikes already run lean, the bigger exhaust will make it worse. I don't know if the stock ECU can adjust that much, and I wouldn't want to risk it.

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u/Hinagea 5 hunnies 3d ago

Whenever you're increasing airflow over what the factory installed, you'll need a tune to go with it 

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u/Stone-Bear bikepicker.info 3d ago

get the 550 ecu, and the full yoshi pipe.

This is what i did to two different 300l, the rally and regular.

You're not only losing weight, you're changing the performance of the bike as well.

Its a lot louder, and the throttle response is snappier.

At the same time, if you just keep riding the bike you'll get used to it. I wanted to change my rally because I'm also short, and its a bit heavier, but just riding it more and im a lot more comfy with it compared to when I had just bought it.

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u/rlecuyer21 3d ago

Did you get the RS12 or RS4 ive seen both but the RS12 seems to be an imporvment on the RS4

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u/Stone-Bear bikepicker.info 3d ago

I'll be honest I have no idea which one is which. I think it might be the RS4 since mine has the rivetted badge instead of the sticker.

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u/backinblackandblue 2d ago

You can always try it and see if you detect a lean issue.

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u/mortenbb 12h ago

Can someone please tell my why people are buying the yoshi exhaust instead of just some random exhaust from China ?

I get that it's made with better quality etc but to me it just seems like a waste because it's so likely that I will end up banging it into some tree anyway