I bought this product to increase HP and MPGs, which it has. I would like to say that the instructions were not the greatest. They could have added some photos to make it a little easier going through the assembly process. Another let down was the coupling rings that are needed to install the system. They came deformed and I had to use a hair dryer to heat them up and then use as much strength as I could muster up to get them over my stock parts. The breather assembly is chrome over plastic, so the anti-vibration mount broke off with ease! Nonetheless, this is a great product. It has improved at least an added 1 MPG, the sound is great as you can hear it suck in the air and the price was over $100 less than the competition. Thanks Overstock.com for the great deal...