I did this mod along with the FRx and it made a big difference in the running of my engine. It is much quieter and runs smoother with quicker throttle response. I would recommend this to anyone that has the 7.3 engine.

Install went smooth. Truck idles quieter and smoother. Highly recommended.

Some people have said they can't tell a difference, but with my experience, my truck idles quieter. Great product, we'll built, and very easy to install.

I put this on my e99 and have to say, it fits nice! Has a tight fit under the spyder inlet clamp but when everything is tightened up the fit is real snug and nothing touching. I did notice quieter start ups and idleing. Even running a low rpm through town it just sound quite and maybe even smoother. Great product and will recommend to any 7.3 owner.

This things drops right in. There is no bending or forcing of the tube to get the threads to line up. It is so easy to install because the fit is so good.

Installed the HPx line prior to my other upgrades just to see if it would make any difference. It did. Used to get a loud cackle when taking off in 1st gear with low throttle, but this has greatly reduced the noise. Neighbors should be happy now. Slightly awkward install for me but definitely worth it. Thanks RiffRaff!

Installed in less that 30 min, it's a tight fit if you have a 38r. Didn't really notice and smoother idling due to bad injectors but deffinately quieter on the injection noise.

Installed on my 2002 f350 in about 30 mins works and described no complaints

Ordered this to replace a home made hydraulic hose crossover from a prior truck owner. Looks great under hood and went on easy. I feel more secure that this isn't going to pop while I'm driving.