Review on HPS 27 269P Polish Non CARB Compliant by Jesse Bailey

First, it's a lot louder than you think. I have a mid-range radio (color screen, no navigation) and you can hear it over the music at volume 20. Every wire vibrates under the dash (high pitched hum in my video) and you can feel the vibration in the gas. Pedal (3500 rpm) which is like a slight pulsation of pressure on the brake pedal. This caused a permanent CEL that does not go away after reinstallation and returns after cleaning the code. The company has terrible customer service that doesn't answer calls or emails. I've also noticed that their average mpg is worse, but that could be because the car has been reset to some default settings since I had CEL, or it could be because of the Florida heat. --- My rating is all over the place but basically it sounds cool if you don't care about a silent car. It sounds like a Subaru boxer engine.