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What is the primary size? I don't want to take from this thread so an explanation. The 75mm posted from a Gen6 made me start running more simulations on exhaust primary and collector sizes. What I found is the primary size a little larger than 41mm and the collector size larger add a little horsepower. I suppose the balance connections might allow the primaries to perform as larger pipes. So I started looking, 60 and 65mm silencers make more power as well. I think the 75mm is planned and actually done to add power.
 

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Discussion Starter · #24 ·
The post I made earlier is slightly incorrect. Turns out the ECU p/n: 21175-1723 AND wiring harness p/n: 26031-3773 are BOTH new, before I had stated that JUST the wiring harness was new. The data connection tool p/n: 57001-0011 appears to be the same as the one used for 2016-2020 bikes.
 

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Whats availability on these (10rr) can't get any information from Kaw corporate, when will these start coming in
 

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Good day guys would like a second opinion on the 2021 zx10r headers.. I'm running a full M4 titanium system on my 2019 zx10r KRT. Wanted to go with stock headers, it seems I'm getting some restrictions in terms of pipe size...would the 2021 zx10r headers bolt right up? Or parts will need to be change out.
 

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@Vince c the outlet on the 2021 header is MUCH larger so a new mid-pipe is required.
That won't be a problem at all just wanted to know if the headers would bolt right up on the 2019 motor, I notice the 2021 headers has a cross over pipe from cylinder 1 to 4 just checking if it would be in the way of the oil cooler on the 2019 zx10r motor
 
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