i just finish install tein h tech on my car. the drop is nice but i notice the car shutters when i pick up speed (around 30mph-40mph) and it feels really unstable. its really noticable on the driver side. anybody know what mite be the problem?

 

Did you tighten down everything when you put it back. A guy I know had a similar problem and it was because he didnt tighten down the bolts under the hood good enough.