I would highly recommend this product. Easy to install. I noticed a significant noise reduction from injectors on startup and at highway speed. Also noticed an increase in throttle response. Highly recommend this product. 1999 to 2003 7.3 powerstroke

Fast shipping, packaged so no damage, and relatively easy install. Made a big difference at an idle and truck seems more responsive. Highly recommend.

Easy install and a overall great product.

Good price , fast shipping. I will continue to deal with Riff Raff diesel.

Great little addition for the money. Super easy instal, no leaks right off the bat. I've only had it in for a few days but am starting to see a noticeable difference. The truck seems to warm up faster, turns over quicker on cold days, and idles a lot smoother. The truck sounds different at idle for sure.

Definitely makes a difference. Pretty simple to install with the right tools.

Perfect fit.

Installed this and FRx at same time. Unlike FRx, this was a very easy install. I pulled the spider because I had to replace my boots at the head anyway. After installing both, only change noticed was possibly the truck was slightly more quiet. Perdels on #8 actually increased by 0.3 to 0.4% after install for a total of 5.1% average. The big difference came when I replaced the dark blue CPS with an original black CPS, dropping perdels down to as low as 1.8% on #8 with an average of 2.2%. Engine is quieter and feels more smooth now.

The part came in as promised, easy to install and works as advertised. Made my start up easier and idles quieter on my 99 7.3 powerstroke