I have an 06 gt. I recently got a steeda package that came with cold air intake, flash programmer, x-pipe w/ high flow cats, and underdrive pulleys. After I got that put on I put on a throttle body spacer and slp loudmouths. Now my car is messing up. Its real sluggish. When I try to get on it, the engine revs and everything but it doesn't go anywhere. I can drive it real easy and barely even notice anything wrong. I took it to the dealership and they thought it was the fuel pump so they replaced it but its still doing the same thing. Anyone have any ideas of what is going on? Could it be my aftermarket parts?