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

OEM was loose and weak in housing. Replaced with gold spring as maintenance measure. Easy to install. I did not notice any performance gain after install. Mileage stayed the same. Great price and quick shipping!

Works as it should. Easy install. You do need to replace the crush washer on fuel line with the one included. I tried to get away without doing it and she was a squirter.

delivered on time good quality

Took less than 30 minutes, I installed the middle spring. Would recommend to anyone one looking for the the spring upgrade.