Customer Ratings & Reviews

Not impressed, shipping was also charged even though i entered the discount code. I suggest you buy gasoline additives elsewhere.

Using the PI Performance improver in my car for over a year. This product has increased performance and given me a smooth ride. Definitely recommend PI Performance Improver.

Excellent product and keeps your car/truck engine with a clean fuel system. Use as directed for optimal results.

Have not noticed any real difference in the mileage factor increase or otherwise when using the PI Performance. I do still purchase to help keep the system clean and at peak performance. My Ridgeline has 140,000 miles and not been tuned up yet for it's first time, because there is no build up on the plugs and she still runs like she always has and the engine is clean due the PI Performance and the Signature Series Synthetic Amsoil used. I would recommend it's use increased mileage or not just as a preventive measure to keep the system clean.

This is no snake oil! I immediately noticed more power and increased fuel mileage in my jeep.

PI makes sure your engine is clean and maintains it's performance. I've had friends use it and notice the marked improvement with just one bottle.

78,ooo miles on my Jeep. The throttle response is like new. I use this as directed and it definitely makes a difference. For the cost, it’s well worth it. Try it and use it as regular preventative maintenance. You will understand.

Don't know if it works. Way to expensive, then put shipping on top of it.

I use PI every 6 months and can really tell the difference in performance of my 2011 Ford F150 5L V8. Engine still purrs because all I've ever put into is Amsoil products.

I use this very often in my truck and wife's car. Works great!!

Used it in my Nissan pickup works great.

This item does what it says it will do my 07 Ford Sporttrac 4x4 V8 runs so much better with 293,000 miles on my truck .

Provided a noticeable boost in performance and helps to run more efficiently

I'm using it on my cars. so far so good.