Installed the HPX while changing the HPOP orings out and cleaning up the boots and valley. There is a very noticeable difference in the noise and smoothness of idle.

I guess I didnt tighten them enough and they leaked, one side note than the other. I was surprised how much I needed to tighten the line fittings. Once I got them tightened down and running it is much more quieter like others have said. My son even noticed in a 5 sec video. He is probably going to buy one too.

Installed the HPX, FRX, banjo bolts and SS fuel feed lines on my 2001 F250 with 7.3 a couple of weeks ago. Not sure on fuel mileage improvements yet, however, I do think it runs a bit smoother and quieted it down some. This is not my daily driver so haven't even put a full tank of fuel thru it so not alot of feed back at the time.

love the ease to install

Quality looks good and fit perfect. Zero leaks, very happy with it.

Good quality. However, I’m not sure it is worth the hassle as I noticed no change in my trucks running quality (it doesn’t have any mechanical problems I’m trying to mask)

Perfect fit and finish like all of RiffRaff parts

I just learned about this crossover line that didn't come factory. It makes perfect sense. This is another quality product from Riff Raff that is very easy to install.

Installed and worked as expected, would recommend