K&N Performance+ Fuel System Cleaner: Restores Performance and Acceleration, 16 Ounce Bottle Treats up to 21 Gallons, 99-2050 , Black

I love the overall results. I can feel the smooth idle and acceleration. I bought 2 per vehicle.

Made right here in America and trusted by drivers who care about performance. I’ve used it on my 2018 Impala V6, and the difference in engine smoothness and throttle response is incredible. This is seriously great stuff that keeps the fuel system clean and the car running strong. It delivers noticeable improvements in engine smoothness and throttle response after just one use. It helps clean the fuel system while boosting performance, making every drive feel stronger and more efficient.

If you’re wanting the quick review: Great Additive, Does work, Makes a difference, It’s only 7 dollars, Perhaps it’ll even make you go vroom vroom faster. If you’re wanting the long review: I would take a star off due to the incorrect delivery date being given, but it was through Amazon so it doesn’t really matter as it’s a big company, but overall, the additive is great. I waited until I was approximately 1-2 gallons in my tank, close to E. I put it into my tank with another additive and I feel as if I cannot mention it as it will seem like advertisement. So I put the whole bottle in before I filled my tank up to about a quarter with 93 from shell since they add detergents to their fuels(Exxon does the same) to try and clean up the fuel system better (In my theory. I’m not an expert nor advising you what to do, I’m just explaining how I used it!) from word, it’s better when you are taking a decent trip 20-30 mins/ miles on a highway with less frequent stopping. Immediately after adding the K&N and letting it kick in I could notice a difference. My ride was smooth and had more responsiveness to it as advertised on the bottle. It was a fun drive to say the least as I have a stock challenger(sxt, (R/T and SRT’s don’t hate on me it’s paid off, I’m young, cheap on the insurance as it’s in my name )). In conclusion, if you’re noticing sluggishness and decreased performance on your car, no matter the make, model, it is a great start to spend 3-10 dollars instead of going to the dealership and forking over much more than you’d like and even then, if it didn’t fix the problem, you’ll have a cleaner system after they fix the issue so at least it isn’t a total loss.

I have a 17 years old car with minimal maintenance, so this fuel cleaner is cheap, so I tried it out. You basically just pour it into your gas tank before filling with gas, and then drive normally. As far as the functionality, it's hard to tell if anything is running better or it's just placebo. This car didn't have any major issues, so even if this product had the ability to fix them, I wouldn't be able to tell.

The K&N Performance+ Fuel System Cleaner promises to restore performance and acceleration by removing carbon buildup in your fuel system. Improved performance and acceleration: Many users report experiencing smoother operation, increased responsiveness, and even slightly improved fuel economy after using this product. Easy to use: Simply add the cleaner to your gas tank before filling up. Affordable: Compared to professional fuel system cleaning services, this product is a budget-friendly option. Wide compatibility: Works with most gasoline-powered vehicles, including direct and traditional fuel systems

I used two bottles along with the K&N fuel booster. After a couple drives, the truck felt smoother and more responsive. Solid combo, I’ll use it again

It works great, but why has it DOUBLED in price in the last 8-9 months???? 5 stars for the product 1 star for the price increase

Great cleaner and quick delivery.

I recently used the K&N Performance+ Fuel System Cleaner (99-2050) in my 2012 Holden VE Calais V8, which has a 6.0L V8 engine, using high-quality BP 98-octane fuel. I followed the instructions, adding the cleaner to a nearly empty tank before filling it up and driving on the highway. While driving, I noticed a brief period of engine shuddering, and the check engine light came on temporarily. After a short while, the issue resolved itself, the light turned off, and the engine returned to normal. I scanned the vehicle with a high-quality OBD-II scanner, and no error codes were found. I believe this might have been a temporary effect of the cleaner dislodging carbon deposits in the fuel system, as described in the product details. The vehicle now runs smoothly, and I appreciate the cleaner’s ability to restore performance, as advertised. However, the temporary shuddering and check engine light were concerning, and I’d suggest adding a note to the product instructions to warn users about potential temporary effects during the cleaning process. This could help others avoid worry. Overall, it’s a solid product, and I plan to use it again, but clearer guidance on such effects would improve the experience. Thank you for a quality product, and I hope this feedback helps improve customer communication!