Install isnt bad. Make sure to tighten some other nut/bolt somewhere at the recommended torque to feel what it's like because you cant fit a torque wrench back there and read how many people broke one in the reviews. Practice reinstalling the old fitting to get the positioning right so you dont drop the new CVD. Once youre able to thread the old fittings a couple times move to putting in the new CVD. Be sure to add the passenger side fuel line and FrX while youre back there to really make this worthwhile. Truck is shockingly smooth/quiet at idle now and throttle response is superb. Shoulda done this 3 years ago when I got the truck.

Great upgrade to an OEM fuel system.

Huge difference in flow, and an easy install.

Wow, my old fittings were very hard to blow thru, 330k miles. truck starts up faster now.

I love this product as as mentioned in other reviews once you see the stock ones you will understand why this product exists it’s much less restrictive. The only thing I would change about this package is I would Include new rubber viton o rings even if you would have to increase the price of the package because I forgot to other those and then had to go out and buy them separately to finish the job the same day. But awesome awesome quality

Worked well with my stock fuel lines, just don't forget to purchase the VLV-4 fuel sleeves as well. Once you see how restrictive the stock ones are you will know why you spent the time to install these.

Worked as should and improved truck performance

Replaced the old ones with these and fixed the fuel leak right away. Great product. Highly recommended

Not hard to install and way better flow. You don't realize how restrictive your stock ones are till you see them for yourself.