Great quality and super easy to install.

100 miles in. Works as should, didn't notice much of a difference, however the idea of the product is a nice thought.

Went on easy and made the engine quieter at idle

Easy install. Perfect fit. A definite difference in the idle quality and noise level. Another great product from RiffRaff!

Can't go wrong with the suggestions from riffraff on what products are a must for building a reliable 7.3. Seemed to run smoother and along with the fuel crossover and SS fuel lines it really woke the truck up.

Was skeptical about this making a difference but after installing it I’m a believer smoother running idle sounds solid definitely buy if you don’t have one

This is a great product from Riffraff. Installation was very straightforward. The tube was shaped perfectly and the instructions were very clear. I did not remove any of my CAC pipes or spider and was able to reach both fittings just fine with standard wrenches. Follow their torque specs and do not exceed them. I did notice a smoother idle after installing the HPX. The most notable change was in the exhaust sound at idle. My 5” straight pipe used to be “choppy” at idle and is now much smoother. I definitely recommend the HPX.

Fast shipping and great quality. My truck idle so much quieter. Nice to have a balance in oil pressure. Smooth running too.

Easy to install. Oil pressure seems more stabilized which makes the engine run better and quieter. Pair this up with the FRx kit and you'll be very pleased with the response from the engine. Wish I'd done this a long time ago.