FI light after Akrapovic 4-2-1-2 installed



Just installed Akra 4-2-1-2 on my 11Busa, Took it out for ride and red FI light illuminated, This only happen when i rev it over 6000Rpm and back off the throttle,
My first guess was the ECU need time to adjust, But not so sure about it, Any opinion? Or should i go PCV?
You need some form of tuning. Whether you use a Power Commander or ECU flashing is up to you, but most people with the ability to get it done prefer ECU flashing. Running a full exhaust system with no fueling changes is not good for the bike, and will cause a lean condition. If you want to optimize your engine's performance and avoid potential damage, you will have to have it properly tuned.
I chose Bazzaz Z-Fi.

My opinion, go AFR+TC+QS about a thousand bucks but any Qshifter and fuel module sepparate will cost you that. The shifter seems to be a very nice and versatile one.

Add Z-AFM later if you want to refine tune.
As others have said, you either need a tune and/or the o2 bung dummy to keep from tripping the light. Bazzaz, PC, ECU-editor all are great but the most important part is the TUNER! Find one that really knows what they are doing and go with what they recommend or work with... ;)
I had the full dual Akrapovic on my 08 gen2 and never had a problem or an FI light, and without a dyno tune.
I also used the stock O2 sensor.
running a full akrapovic system
Never done an ecu tune nor am I running any type of pc.. been 24k miles and no f1 light.
i did another 300 miles today, No sign of Fi warning light again, Guess it was just the error d/t new pipe,
What i was noticing yesterday though, there was a strong fuel smell from both can, But not that bad now,
Will do another 300 miles trip again tomorrow, Will see how it goes,
You still need a tune or at the very least confirm the A/F readings on a dyno to make sure you aren't going lean...
If it happens again I would suggest dealer mode so you can see the code / codes. Best of luck.