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I would say get the tune, your bike is going to be running lean and could be stalling all the time. IDK up to you though, I know my friend's bike after he put a new exhaust on he couldn't ride without stalling it all the time. But just my thought someone might say something else.
 

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It will run, but not necessarily fine. It would be best to take full advantage of the increased exhaust flow by getting it tuned. If the point of the exhaust was to increase performance, it only makes sense to get it tuned for that change.
 

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Discussion Starter · #4 ·
I’ve been looking at this one. What do you guys think? Is it good enough?

 

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I’ve been looking at this one. What do you guys think? Is it good enough?

Rapid Bike appears to rely on the OEM narrowband O2 sensor. It is accurate only between about 14.6 to 14.8:1 AFRs. https://support.haltech.com/portal/en/kb/articles/narrowband-vs-wideband-oxygen-sensors-explained. Under load, your target AFR with pump gas should be 13.2-12.8:1; the narrowband sensor can't read those mixtures. That's why most similar devices use a wideband O2 sensor to measure AFRs.
 
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