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I would like to install a slip on exhaust for my 2020 R3 and do not know if it is California legal. The one I am interested in is the Akrapovič slip-on line (SS) S-Y2SO11-AHCSS.
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Welcome to the Forum. I have Akra's website attached below. Unless I'm reading it wrong...the one you're looking at is not street legal.
Their carbon slip-on S-Y2S016-HAPC/1 appears to be. It's also on their site for the 2020 R3.

 

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Thank you for the response. I just read on their website about the slip on exhaust I want and it says non carb compliant for California. I don’t understand why this is not compliant or maybe it is for my motorcycle after all it is all stock and this is just a slip on. I would really like to be able to use it but don’t want a fix it ticket and have to put the stock exhaust on because I hate the sound of it and it is bulky.
 

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Just remove your stock muffler, it'll be better and cost less and your bike will weigh less. Slip on is not a thing to even try with the R3 since the catalytic converter will still muffle and choke the whole exhaust. Go with a full system or just remove the muffler.
 

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Thank you very much I will take it off and give it a try I just don’t want to get that thousand dollar fix it ticket and I really like the look of the slip on exhaust.
 

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California is a WHOLE different ball game. Anything that adversely affects emissions is a no-no. Any piece of the exhaust system or any other emissions-related component that you want to replace, has to have a CARB EO "exemption order" number, which means the manufacturer has to go through a bunch of testing to demonstrate that the vehicle remains emissions-compliant with that piece replaced. This is expensive, and that's why you'll only find EO's on a small sub-set of aftermarket parts, and a whole lot of other manufacturers have big disclaimers about how they're not legal for on-road use in California (and you can get a big emissions-tampering ticket for it).

The other one that you listed, doesn't have an EO number because Akra didn't go through the testing procedures with it. Remember, getting an EO number is expensive. It simply isn't practical or cost effective for them to test everything they make (and some of it may not be compliant anyhow even if they did). I'm actually rather surprised that they offer anything with an EO number at all, instead of doing what most manufacturers do ... gave up on the California market.

"Remove your stock muffler" - No, not legal - emissions tampering - this is begging for a ticket.
"Go with a full system" - Absolutely not legal, it eliminates the catalyst, which is the main emissions-legal part of the whole exhaust system.

You have little choice in the matter if you want to remain legal and still want to change the exhaust system: you have to pick one that has a CARB EO number (and keep the documentation for it just in case).

Bear in mind that it will sound little different from stock ...that's part of the deal with achieving compliance ...
 

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Thank you for the response. I just read on their website about the slip on exhaust I want and it says non carb compliant for California. I don’t understand why this is not compliant or maybe it is for my motorcycle after all it is all stock and this is just a slip on. I would really like to be able to use it but don’t want a fix it ticket and have to put the stock exhaust on because I hate the sound of it and it is bulky.
I have that particular exhaust on my R3. It really isn’t much louder than stock. I agree the stock can is big and ugly. If you don’t like the sound of stock, you probably wouldn’t like the Akra GP slip-on either. Just my opinion-
 

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Buy a used even rashed slipon to get the perforated core and packing . Cut open your stock muffler and replace the guts with the perforated tube and packing and get it welded together. Reuse your oem end cap.

I doubt if inspection would notice anything...

I have a M4 slip on from another bike I sold. I might even be able to buy perforated tube or even a cheap glasspack for a car because those use a perforated tube.

I have no idea what the inside of the stock muffler looks like or how they configured the baffle. There are probably many laying around on this forum someone would part with to experiment with? That way you can keep it stock and if you render the one you are experimenting with unuseable well at least it was interesting to cut it open and see whats inside.I would be suprised if they made it real complicated since the cat box muffles most of the sound. A straight thru perforated core would be the same as the majority of slip ons out there so I don't see it hurting anything.

It only requires your labor and paying a welder to weld it back together. Anyone got a stock muffler they don't want and would be willing to sell cheap?
 

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Buy a used even rashed slipon to get the perforated core and packing . Cut open your stock muffler and replace the guts with the perforated tube and packing and get it welded together. Reuse your oem end cap.
I'm struggling to see the point in doing that for the unknown sound difference you'll get. Yes, the stock muffler makes little difference to the sound as most of the silencing is done at the cat. However, most slip-ons do what the OEM muffler can't do and that's "trumpet" the sound. The ends are usually much larger in diameter than the OEM muffler with less sound deadening material, allowing the sound to project louder than stock.

The slip-on I used to have on had a much louder sound, with a deeper tone (but nothing compared to the full exhaust I have now). If I could turn back time I would have purchased a Chinese copy slip-on for about $50NZD rather than the $300 NZD I spent on a branded one. I've been impressed with the quality of the exhausts myself and others have ordered off eBay.
 

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The title of this thread is "California legal slip-on exhaust".

Anything without a CARB EO number is not legal in California.
 

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I guess my point about modifying the stock muffler was do you think inspection would realize it was modified if the outward appearance was the same and it was a little louder?
 

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Sounds good, definitely louder than stock. You notice it a lot more when you're accelerating at high RPMs. I always ran it without the baffle as it's not obnoxiously loud.
 
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