I have an Edge CTS2 tuner and one gauge I monitor is the ICP pressure. Before the HPX at idle the ICP pressure would fluctuate about 50 psi. After the HPX the pressure fluctuates only about 15 psi. Which proves this product reduces pressure spikes. Idles and run smoother. Easy 30 minute install. Awesome high quality part from Riffraff.

By far one of the easiest most I have done. After a day of letting the air purge you can really tell the difference at idle. I shouldn't have waited so long to do this.

Installed easily fit was perfect.I was not sure of any change until my son was riding with me,he asked what had happened to truck he could hear the stereo at lower volume and he thought it was easier to hear conversations. 5 stars based on ears of a 14 year old and fit and finish of product. 99.5 with AFE intake, wicked wheel, 4" turbo back exhaust, delete plug.

Smoothed up my idle and i also noticed the engine is a bit quieter. Definitely recommend this for any 7.3 powerstroke.

Seemed to quite engine down a little

Works as it should only reason I'm leaving a 4 star instead of 5 is that supplied instructions give a torque amount too high for the tube adapters. (Split an O-ring)

This product is great, I installed it at the same time as the FRx. Idle smoothed out and installation was a breeze. I will say however that if you have a AFE intake manifold, this HPX will interfere with the mounting bracket. Not a big deal but I had to make some creative adjustments.

The bends on this are all perfectly placed to clear the pedestal and is flat to not trap air bubbles. Perfect in every way. Super easy since I already had the manifold off to replace the turbo and pedestal o-rings. Replaced all boots and added reinforcemaent plenum rings also.

Easy install, quality part, yes the truck is noticeable quiter at idle! Less racket from under the hood make the exhaust note that much sweeter! One more Riffraff home run! Thanks Clay