I got these to replace my stock shocks as recommended for a 50,000 mile service. Just bought the front carrier. While I didn't immediately notice leaks or issues with my OEM shocks, the difference with Bilstein compared to OEM's is INCREDIBLE! They're much smoother, less bouncing and the trucks feel a lot safer on the road. Make sure you take the time, get proper training and have all the necessary tools and safety equipment like jack stands if you plan on doing this job yourself. Once prepped it's not hard work and it took me about 30 minutes in total to do both.