So here is the deal. After my Z has been parked for a few hours. When I start the car and begin to drive in 1st gear for about 15-20 feet, I notice a grinding sound from the front side of the car. Also when I hear this sound I can also feel the car slow down slightly at the same time. This effect goes away in a second and doesn't replicate itself during the trip but once I park the car for a long period of time, this happens all over again.

I have an 2004.5 Enthus. with Tein S-Techs and 19" Volks.