Spring kit works good and is easy to install. I recommend buying the upgraded billet housing riffraff offers because i

Quick 15 min job and brought the truck back to where it should be I used the gold spring old spring was getting week after 180000 miles

I couldn't tell the difference between the silver and gold springs. Either the difference was very subtle or I got 2 silver springs. I took a guess at which I thought was gold and put it in.

Being a shop owner! This product really help with smoother idle, better take off, fuel mileage, I would recommend it for stock or tuned.. Wanting to make real power upgrade the fuel systems completely!

Complete kit, has the seals and springs you need to do the job. Tried one from Amazon and I couldn't keep it under 80psi. This kit is perfect, 63psi and made in usa! Recommended for everyone that hasn't updated their springs yet.

Took less than 10 min. And I have a greater throttle response!

Went with the gold spring. Bone stock truck, NAPA 6637 air filter is only mod. Better throttle response, and allows truck to get into the higher RPMs quicker. Doubtful it helps with mileage, but I don't think it hurt it either.

Good upgrade and repair for your old tires stock spring. My truck idles smoother, and starts up quicker. My butt dyno didn’t pick up on any hp or torque gains with the blue spring installed but I did see a slight mpg increase on the highway.

There great they work fine I'm only writing this to let yall know with the black spring I was getting 80 pounds of fuel pressure so I took it off and went to gold i