Review on Spectra Premium F57C Classic Filler by Ryan Hadden

As a result of using this automotive product, I found that it did not improve my car's performance as promised. While it was easy to install, the Spectra Premium F57C Classic Filler failed to increase fuel efficiency or horsepower. In fact it caused my engine to run rough and even stalled during acceleration. Unfortunately, the only pro is that it looks nice, but this is outweighed by the cons of its poor performance and negative impact on my driving experience..