Took 10 minutes to install this, and I do believe it smoothed out my idle and injectors. This is a quality product. Riff Raff has my business for life. Rock on!!!

After reading the reviews I decided to install an HPX. $50, whats to lose... I was very impressed! I took a decibel reading before and after and my truck saw a 5 decibel drop in noise. Runs quieter, starts better, and idols smoother. Shoulda added this years ago. Why wasn't this installed from the factory!?

Why Ford didn't do this is beyond me

Very easy to install. Quality product. Did not notice smoother idle or quieter operation of vehicle though

Works great, easy to install. Did seem to quite down the motor.

Works well, engine is quieter and smoother, even had strangers comment on lower noise level. Only down side is it has to be removed to get the turbo out

This mod only took a few minutes to install. It is better built than most crossovers I have seen, and has a larger diameter than others iv seen. My 7.3 sounded very loud rackety, and annoying like they do. It had a rough idle before. My pickup is much quieter, and the idle is great. My friend noticed my pickup sounded quieter and asked what I did to it right away. Anyone with a 7.3 should have this. Why it didn't come from the factory baffles me.

I put this on in about 30 minutes, and am really happy with the results. Much smoother idle, and quiets down the noise. Really should be a stock design.

Should have gotten this when I bought the truck. The stainless line is easy to install and only takes a few minutes to install. Looking to buy more products for you!