K&N Performance+ Octane Booster: Boosts Octane and Improves Engine Performance, 16 Ounce Bottle Treats up to 18 Gallons, 99-2020

Noticeable increase in power in my supercharged v6

I tried the K&N Performance+ Octane Booster in my car, and the difference was noticeable right away. • Improved Engine Response: Acceleration feels smoother and more powerful. • Reduces Knocking/Pinging: Keeps the engine running clean even with lower-quality fuel. • Easy to Use: One 16oz bottle treats up to 18 gallons—just pour and go. • Trusted Brand: K&N is well-known for high-performance automotive products, and this one delivers. • Peace of Mind: Helps protect the engine while maximizing fuel efficiency and power. Final Thoughts If you want a simple way to improve throttle response and overall engine performance, this octane booster is worth it. A must-have for anyone who wants to keep their car running at peak performance.

First of all, I have to admit that the product actually seems to work. I currently use it for 4 vehicles. Since one bottle is enough for 68 liters of gasoline, I have weighed it accordingly and calculated on the tank capacity of my vehicles. I originally bought it for my Yamaha Raptor to give it something beneficial, since here in Paraguay we have gasoline with 96+ octane maximum and I have the Big 3 installed on my Raptor. After seeing some videos on the internet where octane boosters were tested in cars on a dynamometer and a power increase of 3 to 6% was MEASURABLE, I thought: I'll try that too. A direct increase in performance I have now not necessarily felt. But the engine runs very well. Good response. Definitely not worse! Next was my Yamaha WR450F. Again, I must say, it definitely does not run worse. But since the bike has endless power anyway, I don't notice any "extreme" boost in power here either. What I have to say though: It has helped to optimize the combustion. The exhaust is much less sooty! Now my last experiment: We have 2 China scooters with 125cc and carburetor technology and the two parts run far from optimal. When cold, they hardly start at all and they smoke non-stop out of the exhaust. Despite several times disassemble carburetor and clean and adjust, nothing could be improved so far - and in the beginning, the scooters ran very well, without problems. Now the miracle! Again, I added the K&N octane booster and wow: after a warm-up and then full throttle and smooth driving for a few minutes no more smoking from the exhaust, no backfiring, no knocking. So far I have ALWAYS had problems with knocking with my scooter. Especially at full throttle and the heat here because the engine is only air cooled... But since I put the booster in I have not had one jerk, stutter, knock or misfire. Both vehicles run SIGNIFICANTLY better. Cold starting works much better now too! So in conclusion I can say, especially with carburetor technology and air-cooled engines and that in warm climates, the octane booster pays off!

My car was stumbling at idle. After I repaired the issue myself with a battery replacement. As I didn’t know the age of the spark plugs/ignition coils, I decided to replace all six. The old ones were in great shape, but my mind was set already. Knowing that there had to be a lot of carbon deposits, I wanted to “blow” them out whilst minimizing more build up at the same time. I have found out that I have no performance/mileage loss from using mid-grade with my first BMW E60, but I get 93 octane as my default. I added this booster to my full tank. I drove at highway speed for an extended period of time to break in the new plugs/coils. I was getting over the estimated mpg and it didn’t drop very much on surface roads! The car was a bit more responsive overall. Even without the new parts, I believe that the slight performance would have still occurred.

Some brands are way more expensive and not an inkling better. I does make your car run better for sure. Don't expect a new engine but if you are experiencing knocking or think you might have gotten a bad tank of gas it won't hurt you to try it.